From what i remember being told by my dealer, who is a friend of mine and from reading different things, there isn't really any sonic difference between the two. I'd say go for the 7250 at a great price. I have the Ref50-Ref200.5-Ref200.2 in my rack. I'm very happy with it.
BTW, i do use the balanced connections. I've never tried the RCA connections. Sounds great and is extremely easy to connect & disconnect with the balanced cables. They snap in with a gentle push and lock down tight right away.