There's a chance you could run sysprep, then create an image, then lay the image down after you create the array. That might work, but you would do all of that for very little to no gain, plus likely higher seek times. RAID0 is all hype. That's been proven 5-6 years ago, and still remains true.
If you want real performance, you are on the right track with an SSD. 249 GB of programs is a massive amount. Are you sure that isn't including data files as well, like docs, pictures, music, etc? If not, you always would have the option of installing some apps on a second drive, such as a much larger HDD. I had to do this with a 60 GB SSD, then a 128 GB SSD. Now that I have a 240 GB, I have plenty of space for all of my apps and games.