I've hooked up my parent-in-laws ProJect Debut USB turntable (the one with the built in phono amp) and it sounded fantastic... Nice bit of Pink Flyd, Nat King Cole and some old Motown plaed through it and I was immediately jelous...
Just no where to put one or else I'd have snaffled one up by now!
As far as I know/remember it doesnt have a phono in so you'd need an external phono amp to connect to one of the RCA inputs