USB audio-- opinions? Options

Hey guys,
I'm glad to see a forum dedicated to music-making on the Mac.  It kinda feels, well, like home.  But that banner reloading every 10 seconds is annoying-- I'm going to have to use iCab more often, I guess .

Anyway, I'm thinking of buying the US-428 or the new M-Audio Quattro interface for my G4 tower (and possibly future TiPB).  Are there any owners of any USB audio interfaces (including Roland U8, etc.) that can give me an idea of the overall value of these devices-- like how consistently they work, how good they sound, etc., compared to PCI interfaces?

Thanks, guys.

Dallas Vaughan

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www.dallasvaughan.com