Audiogoner DarkMobius has offered me up some very reliable advice on multiple occasions and recommended these tube pre-amps in the $1K-$2K range to me a while back:
ARC, CAT, BAT, Modwright 9.0, VTL, Cary, Air Tight, Melody
ARC, CAT, BAT, Modwright 9.0, VTL, Cary, Air Tight, Melody