Also be aware that running RAID 0 will double your risk of hard drive failure. Not because its more taxing on the drive, but you'll have two hard drives 'acting' as one and if one crashes, you'll lose the data on the 'combined' drive.
However, you'll get a good performance increase, not FPS wise in games, but boot time and load times and large file transfers etc. One drive in non-raid you'll get about an average of 60mb/sec transfer rates, and in raid 0 you'll see around 100-105.