I love my Harts
with my Roland TD-12 module but I have an upper end kit. I'd stay away from the Roland HD-1 (pedals not adjustable nor realistic). In a lower price range I'd say Roland TD-6 or get a Yamaha
. Definitely look for used as the Rolands retain their value pretty well but you'll still get a better deal than new.
If you're handy, you might consider an acoustic to electronic conversion. You could get a TD-6 module and some brand name E cymbals (they're more difficult than drums to convert) and do the drums really cheap (drum quality, bearing edges etc. don't matter).
Check Unofficial Roland Vdrums Website
DIY threads for more info.