Hello and welcome to the forum!
As BBH is referring to above, it's actually quite the misconception that RAID 0 is better for gaming. The FAQ calls it the "holy grail" if I remember correctly.
If that were my system, I would use the Raptor as your C: drive, and perhaps get a much larger Seagate as your D: drive. (7200.10). Then, install of your software to the D: drive. Also, you can use the D: drive for a Ghost image backup of your C: drive, which still has your email, "My Documents", etc. on it.
If you are not concerned about backups and have lots of space left, I would probably just leave your system as-is. It's going to be a bit of work to reinstall Windows and all your apps after you break apart the array.