I currently play a Marshall JCM 800 2205. 2 channel. While its not a bad amp...I think the drive is still a bit grainy/buzzy for my tastes. A bit thin. I'm not into super high gain at all. In fact, I like that classic rock "fat thick" sound. (Think old Aerosmith, AC/DC or GNR). All probably Marshall sounds...I know. I love the sound of a JCM 800 2203 or 2204...but I need a good clean channel too as my band does a lot of clean stuff. I played through a Budda Superdrive 18 yesterday and was blown away at the sound. I loved it. Cleans were really nice (not Fender..but had thier own thing going). But the drive channel just floored me. It was fat, thick and just dripping with tone. None of that grainy buzziness I get out of my JCM 800. I am now considering selling my JCM 800 but am not sure what Budda amp would be best. I'm afraid the 18 watter wouldnt have enough for alot of the gigs I play. (200-300 seat bars). I mic my amp and just need to hear myself. Are the SD18 and SD30 basically just the same amp...with the SD30 just having more power?