Correct me if I am wrong but I thought the Square Deal used specific dies that will not work on the 650. I know the 650 use the industry standard dies like Hornady, RCBS, Lee, Redding and so on.
Even if you have to replace your dies I think you would be happy with the 650. I was considering the 650 a few months ago and I liked the press. I am not too impressed with the powder measure and I don't like the shell retention buttons but other then those two things it is pretty solid. I really like the two speed case feeder and I am a big fan of the roller handle. However, I bought the Hornady AP over the Dillon 650 simply because I could purchase extra shell plates and bushing locally where as with Dillon everything would have to be mail ordered. I am very happy with my Hornady but I would have been just as happy with the Dillon, both presses are aces in my book so don't let the die issue stop you from upgrading.