What is your budget? I saw a Krell Showcase "refurb" at www.spearitsound.com for $2,999.00. That should have a warranty and they are authorized dealer. Used market may be cheaper but for an authorized sale and warranty it may be worth the extra money. I believe this one was 7.1.

Another way you could go is to buy a stereo preamp with a HT bypass and either use a receiver for HT or a cheaper HT preamp. You can find some very good stereo preamps in the $2,500.00 range. The Conrad-Johnson PV14-ls2 comes to mind. It's a tube preamp with bypass and pretty versatile for a stereo preamp. The draw back with using a tube preamp though is tube wear while watching HT.