It depends, I guess. I've given the matter considerable thought...
If I had arcane magic, I'd probably utilise teleportation to make the big bucks, and illusion magic for some distinctly political agendas (I've always wanted to materialise a giant demon in the sky above Jerusalem and give a congratulatory speech - "Well done, carry on, you're doing great work here" - to everyone in the vicinity, for example). Later, possibly establish my own Lunar colony (I don't need rocket boosters; there goes 99% of the budget) and a magic academy, with the intention of bringing the world under my benevolent rule.
If I had divine magic, I'd probably utilise healing to make the big bucks, and divinations to discern the truth about creation. I'd probably start a religious movement with the truths I uncovered, and eventually bring the world under my benevolent rule. Probably the boring-est path.
If I had psionics, I'd probably embark on a one-man espionage spree, become rich and influential, maybe get myself voted in as President of the United States. (Not through money - I'm not that jaded!) After that, I'd use my awesome powers to demand face-to-face meetings with world leaders (secure in the knowledge that I've got my own force field), and determine exactly what they're doing, thus establishing my benevolent rule over the planet.
If I had advanced technology (presupposing that it's really advanced technology, like zero-point power generation and self-maintenance nano gestalt intelligences), I'd probably embark on a one-man troubleshooting spree, involving trouble and shooting. That, or become a technological mogul, insinuating my technology into every facet of life on this planet (and probably uploading my intellect into the form of an AI for immortality's sake). And when they can no longer do without me, I'll establish my benevolent rule over the Earth. Note to self: Create cheaper, easier-maintenance alternative to the AK firearms family, and put in a 'stop working' switch that only I can activate.
My favourite? Probably the ultratech, because hey, if it's anything-goes wishing, I can wish for a heck of a lot more. And holograms can do my Giant Demon Congratulations.
