actually the 2x raptors was more for the space rather then the RAID ability or speed. 150gb is not alot if i'm going to try squeezing OS and games on it for the coming years.
Slightly of topic, but I buying a new 150GB Raptor to go with my old 74GB Raptor and Photoshop definitly likes to have a scratch disc rather than Raid.
In fact the three disc setup with OS/PS on one disc, photos on another and the scratch disc on the third would be the fastest way to set it up. Just something to think about before going ZOMG RAID Rulez!