Telepathy/Telekenesis.
Think about it (and as a comic collector for the last 16 years, I have). Telepathy, in and of itself, would constitute massive amounts of brain power. Thus, having this ability would probably give you a photographic memory (& possibly reflexes as well).
Taking that into consideration, you'd have the ability to absorb information directly from people's minds as well as all written information (Like say, read every book in a library.)
Add telekenesis to it (You wouldn't need "Dark Phoenix" level Telekenesis, a small amount would be fine) and you'd have complete control of your body at the micro level. You'd be able to control adrenaline levels, turn off pain receptors, speed up healing (by manually controlling white blood cells), & literally "cure" disease.
Hell, if you could figure out "scientificaly" how someone else with powers uses there's, you could "mimic" their powers. Spontanious combustion (fire), weather related abilities (Wind- You could say "make" a tornado, water- Create a water spout, lightning- generate it meteorologicly), teleportation (if, ya know, you could figure it out), healing (explained above) and any other ability that wasn't simply done by "magic" (no Superman flight- but you could fly telekineticly, you could mimic heat vision, perhaps "cold" breath,
Physicaly, you'd pretty much be able to have a "perfect" body. You could even take it to border on superhuman. I remember seeing something on Tibetan monks who are able to put their arms through giant rollers that exert over 600lbs of pressure: which is enough to grind human bones into dust.
In a fight, you'd be able to use any "moves" you've ever witnessed or abosrbed telepathicly as well as "know" what the person was going to do before they did it: if you even choose to allow them to throw a punch. With a gun you could make any shot (Hell, you could even "curve" bullets telekineticly alla Wanted. But it would still suck).
Granted, I'd use said powers selfishly, most likely in Vegas to win oodles of $. Which, in turn, I would spend on hookers and blow.
With great power comes irrisponsibility.
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"The Rich are there to take all of the money & pay none of the taxes, the middle class is there to do all the work and pay all the taxes, and the poor are there to scare the crap out of the middle class." -George Carlin