For sheer 'RAWK' grunt and thunder I've been impressed with a Hartke LH500 through an Ampeg 8x10, but currently I'm running a 1993 SWR SM400 into a Hartke Hydrive 410 and that does everythingI need it too, in fact often I don't even use the EQ, just a liberal sprinkling of the Aural Enhancer® and I'm off.