I run a Marshall JCM800 2203 100W through an old Peavey (don't laugh now) oversize (taller) 4x12, which actually sounds pretty good. After being here, and building my pedal collection, I am actually very happy with the sound. Now. I never run the amp above 2 during practice, and that is louder than we can get for any gig. I am considering getting an Avatar 2x12 to downsize, and maybe zero in on my tone a bit more after doing so. Friends are telling me that I'd probably miss the 4x12, but at these (maximum) volumes, do you, faithful TGP'ers, think I'll miss my 4x12?