Without getting too cheesy...
Of those suggested so far, I have to agree with the Warblade | Psion (kineticist) proposal.
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However, here is my proposal (psionics haters, prepare to cringe!).
Human (good default) Psion 13 | Wilder 13 (no Psionic PrCs I really like)
40pts 1 for 1: Str 8, Dex 16, Con 14 Int 18, Wis 14, Cha 18
Stats after increases & Magic items (assuming a conservative +4 to Int and Cha):
Str: 8, Dex: 16, Con: 14, Int: 25, Wis: 14, Cha: 22
HP: 74 (averaged) + 85 (see Wild Surge 4 augmented Vigor)
Power Points: 378..?
BA: 9/4
Fort: 6 + magic items
Ref: 7 + magic items
Will: 10 + magic items
Powers Known
Psion (25)~ (be creative)
6th: 2 more
5th: Energy Current, Fiery Discorporation, 2 more
4th: Energy Ball, 3 more
3rd: Energy Cone, 3 more
2nd: Damp Power (complete Psi), Energy Missile, 2 more
1st: Mind Thrust, Energy Ray, 3 more
Wilder (7)~ note: since Wild Surge can be used for your Psion Powers, and you have a higher Save DC with those powers, use Wilder for all utility powers. Such as...
6th: Contingency, 5th: Plane Shift, 4th: D-Door, 3rd: Psionic Dispel, 2nd: Share Pain, 1st: Empty Mind, Vigor
Feats~ (I don't have Complete Psi with me, I'll update this later.)
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Important: Wild Surge 4 Vigor + Share Pain + Psy Crystal = DM would have to go out of his way to hurt you.
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Sample Blasting: Privileged Energy (feat) + Empower Power (feat) + ??? (feat from Complete Psi... Metapower-something?) + augmented Energy (fire) Ball + Wild Surge 4 =
17d6 + 34 x1.5...