My last Pre/Pro was the RSP-976 and I still use my RMB-1075 (center and rears). I bought a used Bryston 4B-ST and love it. Lots more power, but more importantly more bass control, more extended highs, better imaging, etc. Really everything improved over the Rotel. All for a paltry $1300.00. If I had to do it again I would put a few hundred with it and get a lightly used 4B-SST. My room is approx. 25x15 with B & W CDM-9NT (90db) and the Bryston has more than enough power.
Now, if I had 3k to spend it would change things. I think it would probably be a Pass Labs that top the list, but, there are lots of amps in this price range and I wouldnt dare spend this amount without being very sure.