what amp under a grand?


I have vienna acoustic mozart grand marantz sr5005 avr,marantz 8001 sacd,vieanna theatro center,b&w 600s3 for rears,current amp adcom 555mk2.looked at used parasound hca 2003 thx, rotel rb 993, and and an adcom 5802.im fine with the performance the marantz gives me for ht but for two channel sound is muddy. i think its the amp? any advice on a used amp that would bring out the detail of the mozarts?
jughead
the parasound 2100 pre with the 2250 amp, brought the va's outta the dark. im hearing the details in the mozarts with much more clarity now. its not louder than the adcom 555mk2 but has more finesse for sure. Viennas get a bad rap about being a dark sounding speaker, not imo. they are a bit laid back for sure, but very smooth and warm sounding, very musical! they deff need a lot of power and good components to make them shine. thank you all for your help and input. speaker placement, pre amp with ht bypass and more power, brought life once again to the mozarts. thank you all.
There are few Crown K2 amps could be purchased at fraction of their brand new price in perfect condition $450...700 ranges.
This amp is like no other pro amp is suitable for high-def home audio applications.