If you like the Ampeg tone, I think you'll really like the PF350. It's got a simple effective EQ so you also have enough to get a nice warm more "neutral" tone if you're shooting for that.
Just wondering what the volume is like on that head paired with a Rumble 4x10. I guess it should be loud enough to run next to a loud drummer and 2 guitars in a blues / rock/country setting