A fun (altough not maximally cheesed) way to deal with those pesky mages and archers taht are rediculously powerful at high levels:
Use a Psi Warrior with a level or two of OA monk, and prolly lots of levels of Crystal Warrior (the monkish psiwar prc from the wotc site). Take telekinesis and dissolving touch, stunning fist (use the OA swap feature to swap monk stunning fist for regular...you use it elss but the DC is keyed to overall level not class level), Expert Tactician, boots of speed or other source of haste, Power Touch, ki straps, and whatever else you want to bump up dmg (Weapon Spec, Metaphys Weapon, stat boosting, etc)
When one of those pesky long-range types goes after you, use telekinesis to yank him over as your hasted action, use your full attack action and stunning fist (optionally, add pain touch) to do a ton of dmg and gain an AOO, then use Power Touch to deliver your Dissolving Touch with it you strike.
Granted, a mage could just use phantasmal killer instead of your TK, and it would be more effective, but where's the fun in that?