I began my gaming "lifestyle" with a SNES. Parents sold it (tragically) and I had to find something else to play on. Got a PS2 for Christmas in 2002 and fell in love. My first series of games that I really got into was Ratchet and Clank. I still love those games, although I've yet to play the PSP version, but probably never will.
Played Halo on PC for a long time, and ever since I've built a computer in 2008, I've been primarily a PC gamer (with the help of Steam eventually). I also game on my PS3, and quite enjoy the Ratchet and Clank games for the system as well as the other exclusives. My favorite series would have to be Uncharted. Boy is that an amazing series.