yabby you
most of the trojan 3cd compilations i've heard are very good
the congos
and i second what sun city girl said about blood & fire, they have some excellent compilations that can be picked up for cheap
anyway, as far as dubstep goes, tune into
www.rinse.fm between 11pm and 1am on either a sunday or monday night for dubstep. sundays are a bit better because the DJ, n-type, is hilarious. skream has a show from 9-11 on wednesdays too.