I strongly suggest you avoid the Craftsman unless it is a model 100. While they made good saws they made a lot more cheap saws that are now worn out. I have had experiences with two Craftsman, I am not a Craftsman fan but neither am I Craftsman hater. But after my experience with those two, I NEVER want another!! I really believe that Craftsman saws have given RAS the bad name they have.
The things to watch for are play. If there is any play in any of the moving parts it will never be accurate. Some things can be replaced or adjusted to remove the play but some can't. So you better off to pass if your not sure than buy a lemon.
For example, I am a HUGE DeWalt fan. But even a old DeWalt with badly worn ways is not any good. It can be fixed but it is expensive to have the ways machined. More than you would want to spend probably.
My suggestion is watch for DeWalts. Rockwell's and Deltas. (There are others that are good too) I am strong biased to the old cast arn saws. They just held up better than that new sheet metal and aluminum saws. Check the capacity. How tall and how wide can it cut? Does it meet you needs?
When you find one, check everything that moves. Does it move smooth. Check for play in everything. Slide the carriage out and check for play at through the stroke. Thats the main problem. The next big issue is can you rotate the arm and lock in back accurately at 90 degrees? Is there play in the lock? Can be adjusted out or its it just worn out?
If you have to realign the saw back to 90 each time you will never be happy with it. Some people lock theirs at 90 degrees and leave it. Thats fine but your loosing a lot of the versatility of the RAS by doing that. If it the carriage has play and can't cut a true straight line, same thing. You will never happy with it.
Here is my saw. It is a DeWalt GP. I think this was the smallest of their industrial models. It swings a 12" blade. I LOVE this saw! It was the first machine I ever restored and I use it all the time.