As far as D&B goes, my favorites are always gonna be Andy C and Grooverider (prolly bc I'm old). I never buy D&B (well, I never buy any music) because there are soooooooo many free sets and mixes out there. If you want a ton of D&B, check out
http://www.breakbeat.co.uk/ there are free podcasts (if you have iTunes you can subscribe to it) that will give you massive amounts of D&B sets and mixes for free. Check it out...
(Dieselboy is from Pittsburgh - area code 412 - LOL.... I remember when he was just some local kid trying to learn how to spin)
As far as other forms of electronic music....my recommendations would depend on the genre.
Personally, I would say be sure to check out Sasha's Involver and Invol2ver. And of course Sasha and Digweed's Northern Exposure! But that's my personal preference (although I have been in the scene since the very beginning).
If you like Oakenfold (I once saw him spin on 6 decks at a time) then I would say check out any of the Global Underground mixes. You should love pretty much all of them. If you like Ferry Corsten, you should love any of Armand Van Buuren's stuff.