You are going to get
lots and
lots of suggestions.
Here's a good post to get started with:
http://www.shotgunworld.com/bbs/viewtopic.php?f=14&t=253741&hilit=shotguns+under+$2000
Personally, I don't think a pump is the best choice for skeet, which is the game you mentioned you wanted to shoot. You
can do it with a pump, and it's a lot of fun, and we all understand having budget issues at some point. But if you can save up a little bit more, and get a Berreta semi-auto, or Mossberg semi-auto as shown in Jeff's thread, or even a used Remington 1100 semi-auto, it will make the game even more fun, and you will break more targets.
I say this as a shooter that d
oes occasionally use a pump for skeet. Either an Ithaca M37 or Browning BPS. I generally do that if it is near hunting season and I want to practice shooting one of those guns. Other than that, I prefer an O/U or a semi-auto.
Beretta makes one semi-auto that you can find for just under $600 at times. That would be my first suggestion for you.
If you can't go that much, and I understand, then I would look for a good used Browning BPS or Remington Wingmaster, which you should be able to find from $400-$500. Sometimes lower.
Between the two guns you mentioned, I always lean toward the Remington's. I'm not sure what the difference is between the "SureShot" model and the express. I thought all sure-shots were cantilevered slug guns but I just Googled it and saw a version that Academy sells that must be what you are referring to.
Good luck and good shooting!