But any gestalt/tristalt without a full casting class is gimped.
I must dis-agree with this statement. At epic levels, in my campaigns at least, fighter-types tend to completely outshine casters in terms of raw damage output.
I have designed an ECL 180 (non-gestalt) vampire god who does more than double the damage output of Boccob. Boccob, in my campaign setting is an ECL 238 Greater deity.
Then again I actually use rules for Virtual Size Categories, which is not part of the Core rule set at all.
Okay, I'll shut up now.