Upgrade in five channel amplifier


Current System:

Classe SSP 60 Processor
Sunfire Signature Grand Five Channel Amp (Original Version)
Sonus Faber Grand Piano Homes, Solo and rears
Heavily modded Pioneer DVD Player
Velodyne 12" Sub
MAS Speaker and Interconnects

I am overall happy with the sound of my system during movie and concert playback. When I listen in two channel is the problem. The music is uninvolving and I have a hard time listening at length. Thought about replacing the GP Homes but others have convinced me this may not be the way to go. What five channel amp for around 4K used would be more musical than the Sunfire. Listen to mostly jazz and male and female vocalists.

Would I be better off with a excellent two channel amp and a good three channel amp?

Here are some brands that I may consider but have not auditioned:

Theta
Butler Audio
McCormack
Conrad Johnson
Pass
Vecteur

All comments are welcome.
hiflyer
My opinion would be that the amp is not the problem, I would place the blame at the pre-amp. Pick up a very good dedicated two channel pre-amp with hometheater pass-through and use it when you listen to two-channel music.

The high-end pre-pro's are pretty good as music pre-amps and are a good step above mid-fi pre-pro's...but, IMO... pretty good is far from very good.

I'm not saying that an amp upgrade is not a benefit...just saying that I would start at the pre-amp.

Dave
You might want to include the AR VT-100, II or III to your list. I highly recommend going the two channel route with a good transport and DAC.
While I can't reccomend an upgrade five channel amp, I can confirm you are looking to replace the right component! I've had an extended audition of a Sunfire Cinema 2ch amp with the same results. Uninvolving, lack of detail,a bland piece of work. When I replaced it with a Classe' amp it was if I were listening to the music for the first time.