I'd like to stay mortal. I wouldn't say no to an extended lifespan, but I'd prefer it to be finite. Sure, being immortal might be cool for a while, maybe even as long as a millenium, if I'm lucky. But eventually, ennui will set in, and I'll have to go through the rest of eternity hating life . . . either that, or I just wait until I go insane enough to enjoy it again.
Rand al'Thor (from The Wheel of Time) vs. Harry Potter?