I voted the 5150. But the Ultra + I had was my favorite Peavey amp. It had the tones of the 5150,JSX,XXX with in it IMO. 3 channels and a highly Active EQ.
I recently had the Script logo 5150 and it was so much more than just a Good Metal amp and a friend played Blues with it at a few gigs and loved it.
Between using the Low and High inputs on the 5150 I could get Good clean and great Crunch and High Gains.
The Classic's are another Really good sounding Amp IMO and sound great with Celestions.
The others Ive not yet really tried.
Peavey amps are VG and get a lot of crap for being a Low $$$ too High Value. Only Crate gets a worse rap IMO.