Plight of the Lefties 12ga Options

I currently own an Ithaca Deerslayer 37 (2 3/4'' smoothbore) which I have had for 18 years (only shotgun). I love my gun... but for the last few years, I have been thinking of making a change. I am interested primarily in getting a fully rifled barrel and scope (preferably cantilever) for deer hunting. I am also contemplating going a different route and getting my first autoloader. The problem is.. I am left hand, left eye dominant. Not that this in itself is a problem... but based on the last few weeks of research.. it is quite evident that the lefties are left high & dry from almost all gun manufacturers out there. The company that deserves the most praise in this area are Benelli who gives us lefties three great choices (but at a very high price tag). Of course Ithaca and Browning pumps work for left or right... but there is no such thing as an bottom ejecting autoloader shotgun.

From what I can tell, these are ALL the 12ga options available to lefties:

Pump:
Ithaca Deerslayer
Ithaca Deerslayer II
Remington 870 Express
Browning BPS (Cantilever Game, Hunter, Micro, Stalker)

Auto:
Remmington 11-87
Benelli Super Black Eagle
Benelli M1 Field
Benelli Montefeltro

Berretta - nope (though you can change the cast and safety of the 391)
Mossberg - nope
Winchester - nope
Weatherby - nope
Savage - don't think so

This leaves out a number of well regarded shotguns such as:
Pump:
Benelli Nova
Remington 870 Wingmaster
Remington 870 Special Purpose
Mossberg 500
Mossberg 835
Winchester 1300

Auto:
Remington 1100
Remington 11-87 Special Purpose
Remington SP-10 Magnum
Beretta 391
Browning Gold
Winchester Super X2
Wetherby SAS

How very sad.

Well, rather than turn this into a rant, I would like to pose a number of questions that I have come up with. I have tried asking various dealers but nobody seems to know the answers. I have also emailed manufacturers (Ithaca & Remington) but they haven't responded yet.

I find your site very useful... and have read a number of old posts that have been very beneficial. I would like to pick your brains for any additional information you might have regarding the plight of the left hander. Thanks in advance for any information you can provide!

- Did I miss any left hand 12ga shotguns that are worth checking out?

- I am trying to see if I can get the Ithaca Fully Rifled Cantilever barrel (S/N 371882185). The reason I don't think I can.. is because my 37 is chambered for 2 3/4'' and the barrel is for 3''. Does this make a difference? Does it affect performance in any way?

- How does the Deerslayer II compare to the original Deerslayer?

- How cheap is the 870 Express vs the Wingmaster? I would rather get the Wingmaster (of the two) but it is not offered. What differences are there between the two?

- Does Remington offer a fully-rifled cantilever barrel for the 11-87 or 870? From the looks of things, they do not. Here is what their site specifies:
11-87
29615* Premier Deer Barrel Fully Rifled Cantilever 12 21" CL Fully Rifled $308
29606* Premier Fully Rifled Deer Barrel w/ Rifle Sights 12 21" RS Fully Rifled $259
29623* Premier Deer Barrel w/ Rifle Sights 12 21"RS Rem Choke¹ $200
29625* Premier Left-Hand Deer Barrel w/ Rifle Sights 12 21" RS Rem Choke¹ $221

870
24611 Express Deer Barrel Fully Rifled w/ Rifle Sights 12 20" RS Fully Rifled $187
24622 Express Deer Barrel w/ Rifle Sights 12 20" RS Imp. Cyl. $126
24547 Wingmaster Left-Hand Deer Barrel w/ Rifle Sights 12 20" RS Rem Choke $219

- why would the 29625 LH be different from the 29623 unless they are NOT interchangeable? If they are not interchangeable, does that mean that the 29615 would not work for a left hand 11-87? Same goes for the 870: why would it list one as left handed unless they were NOT interchangeable??
- Why would the Wingmaster be listed with a Left Hand barrel when only the Express comes in Left Hand?
- No Cantilever avail for the 870

- Is there any after market barrels that would fit my need (ie Hastings)?

- Does Benelli make a fully rifled barrel for their left hand guns?

- Are Rifled sites removable if you want to add a scope?

- Remington states that if you go below 26'' (I believe) you will no longer be using the pressure-compensating gas system (without modification). I have tried to find out what modification is necessary.. but have been unable to find anything. What modifications are required and how much does it cost? What is the drawback to not using the PCGS?

- What is the difference between Light contour and Standard Contour? Is one better than the other?

- Every manufacturer seems to use a different Rate of Twist. What amount of twist is best?

ok, just a little rant:

- When will Remington step up to the plate and make a left hand 870 Wingmaster?

- When will Browning step up to the plate and make a left hand Gold?

- When will Beretta step up to the plate and make a left hand 391?

- When will Benelli take that one last step to make a left hand Nova

- When will Ithaca drop their old traditions and come out with an auto-loader (LH & RH)?

- When will they all step up to the plate and make a fully rifled cantilever barrel for ALL their guns?

Sorry for the long post. I have been lurking here for a while trying to gather all the information I can. These should probably all go in separate threads.. but I thought it would be worse to have a newbie post 20 threads his first time out.