Dynavectors are great, but in your price range (and with that TT/arm), I think you'd get a better value with a Sumiko Blue Point Special Evo3. They're $350 new. There's a used one here for $250 I think:
http://cls.audiogon.com/cgi-bin/cls.pl?anlgcart&1136221247
Keep in mind that great bass with vinyl is very much a function of the arm and table, not just the cartridge. What I'm saying is if you buy a Bluepoint, you'll be able to upgrade the table/arm later, keeping the cartridge, and you'll get even better bass.
http://cls.audiogon.com/cgi-bin/cls.pl?anlgcart&1136221247
Keep in mind that great bass with vinyl is very much a function of the arm and table, not just the cartridge. What I'm saying is if you buy a Bluepoint, you'll be able to upgrade the table/arm later, keeping the cartridge, and you'll get even better bass.