Unless the information below has changed (I don't have an SSD, so don't know) the advice I've read is to NOT use an SSD for frequent writes... so swap/preview/cache should go to a platter
SSD and Video Editing http://forums.adobe.com/thread/902915?tstart=0
...newer pro series SSDS WITH THE MARVELL CONTROLLER can do well now....many rewrites without speed loss....plextor m3 pro and Corsair pref pro models...check tweaktown. Reviews
I've read the links and several others.
My take on it all is that, while SSD's and their controllers have come a long way in extending their lives, there still seems to be some concern as to how may writes they can handle.
I've decided to go with 2 WD, 1TB, SATA III, Black, 7200rpm drives in RAID 0 on the built-in Marvell 9128 controller. It looks to me like there may be faster but less reliable scenarios (stand alone SSD or SSD caching for an HDD) but, crunching the numbers on the 9128 (only designed for PCIe 2.0 (500MB/s) and only connected to one PCIe 3.0 (1GB/s) lane, the 2 drives in RAID 0 should be able to max out the controller's throughput. (It is interesting that Marvell doesn't seem to make and Asus doesn't use a second controller that is designed for SATA III on their X79 motherboards.)
Now my question is, how fast does a swap/preview/media cache drive need to be ? Or...at what point (how many streams or filters) does it become the bottleneck rather than the graphics card or the processor or the media drive or the... ?