Your benchmarks will look wonderful, and you can pat yourself on the back for improving your performance.
But... Unfortunately, you will not be able to tell the difference in real life. The reason is, that very little of what we do is of an overlapped sequential nature where raid-0 shines.
As a suggestion, use 1tb 7200rpm drives instead. The denser platters transfer data better than the older and less dense drives.
If you want good performance for the OS, get a SSD. That will be a difference you can feel.