I would look at the new TnT line by X-Force, Sparky sells these. Pill for pill you will stomp a hole in a Texas Star, plus they are priced better then Texas Star.
I recently acquired a TS 500 and I already have a TNT HD 600....seems the TNT puts out more power than the TS 500 even though they have the same amount (4) and type (2SC-2879) of transistors? What's up w/that?