Simplest solution is to make the Raptor your boot drive and the other one into a place to put the stuff you rarely access (and also your swap file) to keep space free on your boot drive (disk access gets a little faster if the swap file is not on the boot drive).
If you want to optimize things a little more, you can partition the Raptor in half (150a+150b), install the OS and apps onto the outermost partition (where the disk is faster) and copy your infrequently used stuff to the other partition, then occasionally copy/clone the second partition over to the other drive (150c) while remembering to leave enough room there on that other drive for the swap file.
If you want to mess around with
Dynamic Disks, you can slice up your disk partitions and either stripe them (RAID 0) for speed or mirror them (RAID 1) for reliabilty. There are some trade-offs, of course.
If your motherboard is made by Intel, you may have something similar to the above but hardware-based called
Matrix Storage, which could allow you to stripe part of your disks while mirroring another part.
Failing everything else, your motherboard may have the ability to create a basic RAID0 of 150+150 (really 300+150, but it will auto-shrink the larger to match the smaller) ie total of 300GB drive that runs twice as fast (but is more prone to failure...remember to back up!), or you could go for a basic 150GB RAID1 which is significantly more reliable though not generally much faster (unless the controller is capable of striping reads. Most aren't).
Anyone think of any other configuration to try?
--Patrick
I have Asus X58 P6Tmotherboard (yea it is old now) and it is pretty awesome. I did raid 5 with 4 drives (same speed and size) and made it into 2 partition on the controller side.