Looking at Proceed BPA 2, AMP 2, HPA 2.

Which is the best for soundstage, transparency and detail? I don't need a ton of power, just want the most wide, deep and detailed sound. I'll be using this with an LS3 Audio Research preamp.
Go for the HPA2. Will power just about anything.

Word of caution on repairs though, it's pretty much a 1k deal to fix it if a channel goes.