the 800RB is an excellent sounding amp, becoming a latter day classic. Great eq well designed for getting a variety of killer bass tones. It's different than the SWR sound, though, which is considered more "scooped" than the GK's more punchy grindy mids. But like any good amp, you'll be able find something useful in there tone-wise, esp w/the cabs you've listed. Enjoy, always fun to try a new amp/brand
