Let me start off by stating that it is my opinion that both Rotel and NAD are very good quality gear at their price level. You really can't go wrong with either.
The Rotel models you list would only get you 5 channels, and your RX-V2500 is a 7.1 receiver. Are you running a 7.1 system, or only using a 5.1 setup?
If you want 7.1, then I'd go with the NAD... except that you mention that you could save for another couple of months and get the Bryston. Neither Rotel nor NAD can touch the Bryston. If you can afford it, that's the way I'd go. Of course, you'll still be left with either a 5.1 system, using two channels of your receiver, or needing an additional outboard amp.