After experimenting w/ various pre-amps I keep going back to my Wadia 860x directly connected to my Audio Research VT-50. The resolution is outstanding (especially the low end), quick, quite and clean presentaion. You may find that w/ a pre-amp the soundstage will open up a bit more...but the other qualities out weigh this advantage. Make sure to adjust the voltage accordingly to mate with your amplifier and always use a balanced connection....if your amp is a fully balanced design of course. FYI...my speakers are ProAc 1SC monitors.