I can't tell if you're site whoring or if this is a legit question. If it is a legit question how should any of us know which of these is best for you without any further info to go on. Arbitrarily I'll say the PSP and give no reasons why or why not.
What kind of games do you like to play? Do you like online play? Do you like to play with friends? How much do you care about graphics? How much time do you see yourself sitting down and actually playing?
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If you really don't know anything about gaming and consoles, get the Wii, it's the most new-to-gaming friendly.
And the answer is "sitewhoring".