Well what I would do, not what I did of course, but what I would do if'n I was you, get yourself out to a couple of local matches.
Local Matches??? Yeppers, If you are thinking of shooting SASS then hit their web site and find a club near you..
www.sassnet.comAnd if not them then find what your looking for.
Then when you get out there ask a lot of questions, do a lot of looking around. When you start to narrow down what you like and don't like, ask them people to let you shoot their guns, you will surprised by how many will jump right up to let you shoot.
What I did was go buy a pair of Colt clones, then a Win94, all in .45colt and then got a Stevens 311a side by side all before I went to my first shoot.
The pistols I still shoot but the rest was a waste of money, well not a total waste because it got me into the sport and I love it.
A year and a half later I own 4 pistols (two RNV's), 3 rifles and 3 CAS shotguns with another on order.......
And while you are at these shoots checking things out, check out the gun carts cause you are going to want one.
Hope this helps.