I agree too... but if I were you i wouldn't buy 2 raptor drives... too noisy. I'd buy 1x 74GB raptor drive and I'd install OS pagefile and games on it, without partitioning it, anyway when you reinstall your OS you have to reinstall all your games as well, and i'd keep the 2x 120GB drives for long term data storage... but NO RAID!
If you really want max speed and don't care about the noise, I'd go for 2x 36GB raptors in RAID 0 but I will never stress this enough: NEVER KEEP IMPORTANT DATA ON RAID 0 ARRAYS. I'd just put OS and games and stuff like that on it (no partitioning), while keeping all the important data on the seagate drives (not in RAID 0). So that way if your RAID array fails, you just reformat the ARRAY and reinstall your OS.
Whichever option you choose, I recommend whatever HDD cooling you can find, you don't need expensive cooling but as long fan blows on them, it's ok.