-Outlaw Audio 7125 (new)
-Rotel RMB 1075 (new)
-NAD T973 (refurbished at Spearit Sound)
-NAD M25 (used)
-Rotel RMB-1085 (used)
-Parasound Halo A52 (used)
-Odyssey Stratos HT5 (used) or HT3 (new) amplifier.
If you can find one, an Anthem MCA-3 or, preferably, MCA-30 would be a significant improvement in both power and sonics. With 6 ohm speakers, you'll probably get about 225 wpc with the MCA-30.
The MCA-30, used, less than $1000. New, it was $1800.
Signature Home Theater is still showing it on their website, new, but I doubt it, as Anthem is apparently no longer making 3-channel amps. Still, they might have stock and be willing to deal an out-of-production piece. Normal dealer cost is about 60%, or about $1100.
If you want brute power any B&K amp will work well. They sound pretty good too. The topology of their amps are all very similar. Pick channels needed and wattage desired. Resale is awful so you can pick up a lot of amp in the used market.