Tell your parents that PC games allow much more mental stimulation. PS2 allows for one person to play with their own mental agressions(unless you have online, but it's still limited). PC games allow interaction between different people. I have been playing PC games since I was 10 (now 18), and I have never met a child seducer in my life; they only exist in IRC channels and chat rooms.
In the long run, PC games are better for you. If you go more into them, you'll go back less into the console realm (= saving money by not buying every console).
With maybe the possibility of playing with 4 others on xbox, you have a choice between 200000 different people playing some form of Counter-Strike (my fav online game....now costs like 15$).
I don't know if your parents are against chat rooms, violent games, or just don't want you on the computer, but whatever their reason, I can almost instantly prove it to be false.
*phew....almost went into rant mode
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