If you are primarily a music lover, don't get a multi-channel amp. If I understand correctly, the Parasound is a multi-channel amp? If so, keep it for your HT and get a good 2-channel amp (Krell FPB or go back to the ML 23.5 - which is a great amp) or tons of others. Even at a used price of $1,000 a decent 2-channel amp is going to blow the Showcase out of the water and also the Dreadnaught II which I owned for 2 weeks and sold because it was useless in terms of performance in 2-channel mode!
FWIW I tried to go the 5-7 channel amp route with Krell KAV 1500, Dreadnaught II, Conrad Johnson, and none did it for me in 2 channel. I now run a Krell FPB and a Proceed 3 channel for center and surrounds - but HT is a very low priority for me. Previously I ran a ML 331.5 with the Proceed which was a pretty good balance for HT.
FWIW I tried to go the 5-7 channel amp route with Krell KAV 1500, Dreadnaught II, Conrad Johnson, and none did it for me in 2 channel. I now run a Krell FPB and a Proceed 3 channel for center and surrounds - but HT is a very low priority for me. Previously I ran a ML 331.5 with the Proceed which was a pretty good balance for HT.