Unida are cracking... well, a lot better than Hermano who are a bit hit and miss (new album is a cracker though). I second the Slo Burn recommendation, probably my favourite post-Kyuss band. Most of the better known bands (COC, Down, Clutch, Alabama Thunderpussy (get "Fulton Hill," cracking album), Kyuss etc. are top notch. I'd suggest that if you're into the more riff-based stuff you get your hands on some Sasquatch (I think their two albums go for about 4-5 each on Amazon Marketplace), very under-rated band with bags full of groove. Solace are a brilliant band too, and although their stuff is quite hard to track down you should try and get hold of their "The Black Black" EP, perfect stoner rock. sHEAVY's "Solarized" album is great too if you can tolerate the Ozzy-esque vocals. Also pretty much anything Brant Bjork has touched is worth a look (especially Che's "Sounds of Liberation"). If you're up for something a bit heavier, I second unbroken's Weedeater recommendation for some crazy sludge nastyness. Also get your teeth into some Crowbar, Eyehategod and Iron Monkey. Almost forgot Orange Goblin, phenomenal band... check out their earlier stuff for a more spacey/doomy vibe and their later stuff for groove-based rocking. If you need any more ideas give me a shout, I live for this stuff. Have fun .