tons of shit besides the avalon that will bring out the quality...try the HHB Radius Mic Pre's, Aphex 207, FRM RNP, Studio Project VT1(so i'm told), Grace 101, Summit TLA, all under $600 all good mic pre's
they all sound a lot different, so test them out, get the one that sounds best TO YOU...
and i'm actually in the bay right now...