I don't have the 1100 sporting clays and I don't have the M2. That said, I have two 11-87s (one has been modified for shooting clay targets) and an SBE II. For various reasons I have come to prefer the SBE II, but mostly because I consistently shoot it the best--I use it for everything, including skeet, trap, sporting clays, upland, waterfowl, etc. I consistently shoot 1185 fps 1 oz target loads with this gun and the only cycling issues I have had is with the el cheapo Estate loads. I have even cycled the 7/8'ths oz hot Remington loads without any trouble. Keep in mind though that the Benelli is not a maintenance free gun. You still need to clean and lube the trigger group and rails on a reasonably regular basis. As well, depending on how much you shoot the gun you will likely need to clean the action spring once or twice a year. Finally, the Benelli click thing can be an annoyance at times (the rotating bolt head will not always go fully into battery--most dedicated Benelli users become very adept at looking to see if this happened). But for all that I find the SBE II to be a hard gun to beat in nearly every respect. Of course YMMV.
As Worc said, you may also want to consider the Cordoba, although it will be even more $$$. The porting will help some when shooting clays, although may be an annoyance to dogs and hunting buddies in the field. Oh yes. While my 11-87s are certainly soft shooting, I feel virtually no recoil with the SBE II when shooting light target loads--last week I shoot 350 rounds through it in one day with no noticeable issues. While many question its value, I am convinced the comfertech technology helps, at least relative to not having it. iN the case of recoil gun fit can and does make a big difference--and again here is where the Benelli wins out for me. The ability to quickly adjust cast and drop can make a big difference.