Bigger_bullet,
Is there a range you can drive to that rents handguns? For example, here in the Seattle Area we have Wade's Eastside Guns. They have a bunch of handguns and a few rifles you can rent and use on their range. If there is a range like that in your area, it would be a good way to handle the guns that interest you. Then you can see what "feels" best and shoots best for you first hand. If there isn't a range like that in your area, then check out your Hometown forum. There may be ARFCOMers in your area who would meet you at a range and let you shoot their handguns.
BTW, you can go to the manufacturer's website and see the differences between the various sized and models. Last time I was shopping for a handgun, I recorded all the specifications that were important to me (weight, dimmensions, barrel length, price, etc.) on a Excel spreasheet so I could compare them easily.