You guys all play guitar thru your bass rigs?!?
Phylo, would you be using the PowerBlock in tandem with a preamp or pedalboard? Would you prefer a speaker that breaks up easy like a Celestion, or something with a stronger rating like a JBL or EV?
Ive always had good luck finding used 1x12 cabs relatively cheap ($100-$150, Mesa, Marshall, Crate...)
good luck!