Somewhat depends on your price point, but I guess if you're entertaining the dCS suggested above you've made price a moot point.A single box unit that I currently own is the Audio Aero Capitole, which does 24/192. They also have a DAC unit which does the same. This is an incredible sounding piece of gear. I previously had a dCS Delius/Purcell combo, which was quite good. I prefer the Capitole, I haven't heard digital get any better than with this unit. It also has about 3.5 V of output and a volume control, so you can drive your amp directly, bypassing your pre-amp, if so desired. The results of this must be heard to be believed.
Looking for an upsampler-which one?
I have a large cd collections played on a Classe transport and dac. I would like to try one of the new upsamplers. It seems that there are a number on the market and I have no local dealers. I have no interest at this time in SACD or DVD-A. I'm looking for an improvement in playback of cds not just a different sound. I understand that The Parts Connection has an unit that works quite well but haven't heard it. Any help would be appreciated.