If its good enough for Cannibal Corpse.... :p
The RH150 is also an awesome head, but make sure its the G3 Plus, not the regular G3.
I don't think there's THAT big of a difference between the two, TBH.
Hell, a G2 was even good enough by my standards. I was in a band where one guitarist was using a 6505+ and the other a 100-watt Randall G2 (with chorus, actually), and while it's not hard to figure out that the 6505 was all-around better-sounding (for the style of music we were playing), the Randall would very well hold its own against it.
Other than that... the Crate... meh. It can be alright. There's better, tho.
That clip of the B52 sounds nice. Isn't the AT100 quite a bit more expensive than all of the amps being discussed here? I thought it was around the 600-700 dollar range.