I think the OPs logic is sound. When dealing with a small SSD you don't want to cramp it with applications and games because you want to keep the OS light and responsive. Furthermore without extensive customization, Windows can be quite cancerous on it generic drive causing slight decrements in size as time increases. I currently have a similar set up:
64gb SATA III SSD OS drive
640 GB F4's in RAID 0 for games and Apps
1TB extra for storage.
So in case you're wondering how exactly to do this, i am going to quote myself here from ANOTHER POST in ANOTHER THREAD, please note the shortcuts may not be the same for your motherboard, and that this should be done prior to installing Windows 7 on your SSD
Basically the steps to follow are thus:
1. Plug all drives in.
2. Boot into BIOS, change drive setting to AHCI(options are IDE/RAID/AHCI)
3. Boot off Windows disc and install on SSD.
4. After installation, go into BIOS, change to RAID.
5. Hit Cntrl + I(this was the short cut for my onboard RAID controller to go into its set up screen; refer to your motherboard manual, since its an ASUS i think it should be the same).
6. Select the drives to set up the RAID Array.
7. Select the strip width( 128kb is for average use, post back for specialized use of small files or large files).
8. Create the Array.
9. You now have your entire setup running as you want it.
10. Remember to keep your BIOS in RAID mode, for if you change it the array will fall apart but you wont lose data.
11. Your SSD will remain in AHCI mode.
Hope this helps.Edited by Razultull - 7/21/11 at 7:35am