The only preamplifier I can think of in your price range would be an Audio Research (I owned a SP9 MK II, SP11)before moving on to more expensive BAT tube preamps. An intro to tube preamplifers:
http://www.audiogon.com/cgi-bin/cls.pl?preatube&1300393330&/Audio-Research-ls2b-mkii-great
If you can stretch a bit/haggle I highly recommend this BAT preamp (I owned one for 8 years):
http://www.audiogon.com/cgi-bin/cls.pl?preatube&1299011864&/BAT-VK30-tube-preamplifier
I've heard good things about Rogue preamps, I haven't owned one but evidently it's a good value. Otherwise you're left with a variety of preamps from China:
Jolida, Shanling, Shengda, Dared etc...
http://www.audiogon.com/cgi-bin/cls.pl?preatube&1300393330&/Audio-Research-ls2b-mkii-great
If you can stretch a bit/haggle I highly recommend this BAT preamp (I owned one for 8 years):
http://www.audiogon.com/cgi-bin/cls.pl?preatube&1299011864&/BAT-VK30-tube-preamplifier
I've heard good things about Rogue preamps, I haven't owned one but evidently it's a good value. Otherwise you're left with a variety of preamps from China:
Jolida, Shanling, Shengda, Dared etc...