Short answer: scavenge a couple Spider Valve 112s with good speakers and run it through 'em. Gets good and loud, but probably too small in the long run.
I have two Spider Valve 112s whose chassis bit the dust. Badly. Rather than scotch the entire thing, I ripped the chassis out and kept the speakers and cabs. I have a Spider IV 150 HD. I run into the two cabs and get lots of power. Both speakers are Celestion Vintage 30, 8 ohms, rated 60Wrms apiece. I haven't blown them up yet, but if I push them really hard, I think the cabs will implode. This is my "home" and "small" setup, where I don't need or want to be able to blow the back wall off my house. I use two Marshall MX412As for "real," they're 16 ohms mono/8 ohms stereo. I haven't noticed a lack of power at all. For the first time, I CAN be the loudest guy in the band, but I don't roll like that.