I run a Rotel RB-991 for my pair of DIY NHT 1259's. I also have a Parasound HCA 1500A. Both are 200 watts x2 at 8 ohms and are plenty of juice. If you want more power, go with the Rotel 1090, or a similar Parasound. But I agree with Lthkeepr, don't spend more, you are wasting money. If you want to go even cheaper, Adcom GFA-555's can be bridged to put of 600 watts at 8 ohms. You can buy two of these for $700. Just some thoughts, good luck.
-Kevin
-Kevin