Which USB/Firewire audio interface to upgrade after M-Audio FW410?
 

I use this M-Audio FW410 for years, and seems it is about time to upgrade. I've listen to RME Fireface 800 at recording site, which sound excellent. But I don't need many inputs for desktop playback monitoring. Fireface 400 could be one choice, and Sound Device USBpre seems also interesting. But SD doesn't seem to support Vista. My works are mostly classical music, and my monitors are Genelec 1029A, Sennheiser HD650, and HD25-1-II.
Going to upgrade my recorder to a SD 722, and the audio monitoring interface seems to be the bottle neck in the chain.
Thank you for any input.