If you wanna head back to the roots of your original post- this here is the kind of thing being replicated: http://www.youtube.com/watch?v=jRIA66Mq9EU
For more melodic content, check High Contrast, London Elektricity and B-Complex and the Hospital Records and Spearhead Records labels.
If you want newer stuff with slicker production, but still maintain the bassweight, check out artists such as Misanthrop and Phace and the label Neosignal.
As for dubstep, here's a little shameless self-promotion - a mix I did recently of deeper, more spaced-out tunes. Thread / Mix
For heavier dubstep, check out Vex'd, Distance, Goth-Trad and some of Skream's material.
Another useful link to keep up-to-date on bass music in general is FactMAG - which features free, twice-weekly mixes from a variety of top-notch DJs and producers as well as info on new/forthcoming releases, gigs, etc.