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.