Okay, I picked. First, I was assuming that the travel into the past / future would mean that I went there and stayed there. With that out of the way, here's my logic:

• I wouldn't go into the future because I think it will be hugely foreign, almost certainly too foreign to adapt to without going mad.
• I was tempted to go to the past, since, given time, I could probably amass $100m just knowing what I already know, and then could influence the world for the better (or so I believe -- obviously hugely biased.) But I'm assuming I would be the age I am now, and I wouldn't want to wait fifteen years to have a ton of money.
• So I picked to have the money now, with the assumption that I could be highly useful and do some high-leverage stuff in that circumstance.