I would like to get a kit (or get the parts as per someone's instructions from here) to build a heaphone amp. I would like to keep cost down, but at the same time I would like sound quality (of course!) so it will be a tradeoff between the two. I would like to get this project started because...

I'm running a Denon AVR-588 unit as my surround sound, and I have my Prelude connected via S/PDIF (coax). I pass through AC3 and DTS to the unit for movies, but on games and music I use the DTS encoder. What configurations do other Prelude owners run with their headphones? I have Sennheiser...