Which integrated: Nait 5i, Panache or Shanling?

Ok, my eight-year-old Denon receiver died, so I finally have to pull the trigger on a new amp of some sort. I'm looking for an integrated amp in the $1,500 to $2,000 range. I'd prefer something used to save money.

I think I've finally narrowed my choice to the Naim Nait 5i, the Portal Audio Panache or the Shanling STP-80.

I have B&W 601 speakers and a cheap cd player. Both the speakers and the cd player are candidates for upgrading. Oh, this will be in a small to medium sized room.

One more thing, I namely listen to classical and jazz, though my tastes are really eclectic and I listen to lots of indie rock (but most of it isn't well-recorded...)

Thanks!!