Raid 0 is a great thing to have if are into doing a lot of multitasking or editing involving constant high bandwidth access to your hard drive(s). In gaming, two raid 0 raptors wouldn't make such a huge difference though if you've already got at least a par processor, video card, and fair share of ram. In the long run, raid 0 is nice to show off and say you have, but unless you are into a lot of editing and such, I wouldn't worry about slapping two raptors together, but maybe two cheaper drives, as the pay off is just not great enough to suffice paying the hundreds for the raptors. If you're really caught up on raiding raptors and have the spare cash though, go for it! It will definitely not harm your PC any. Hope that helps!
::-Chase-::