Converting to synthetic oil

[Sirius600]

After owning my ti for about 3 months, I'm finally coming up on my first oil change (teehee). The dealer had used regular 20W50 fossil oil, but I've been thinking about converting the engine over to full synthetic oil.

My main goal is to get a little more performance and life out of my ti's engine. Could anybody give some pointers on the changing process and any recommendations on new oil weights? I was thinking of Mobil 1 (if i can afford it) 15W50 or 20W50.

What do you think?

P.S. I'm in Los Angeles, so the temperature never falls below 50 F, but can get past 100 F in the summer.