The 6065+ (5150 II) is a very nice amp, I personally prefer it to the 6065 (5150). I prefer the separate EQs. You can set up your clean sound in the rhythm channel and your distorted sound on lead with different EQ, resonance, and presence levels.
If you get it second hand just make sure the footswitch is in good condition. They are expensive and you will find yourself using it a lot. Also check that the loop works properly. You switch that on using the footswitch.
I have also been surprised at the sound of the Peavey cabs, given the bad reviews they sometimes get around the internet. Try it, you might like it, and if you are offered a package deal with the amp and cab together cheap enough I'd say go for it. They have an oversized cab