I'm planning on getting the Mushkin Enhanced Chronos 60GB SATA III SSD. I have heard that you can take the 20GB needed on such a drive and place the OS on it making it the boot drive, then take the reamaining 40gb and use it for cache using Intel Smart Response.
^^ that's what I did and it worked out great. I'm using a OCZ Vertex 3 60GB on SATA3. I installed win7 64bit home premie on it and it works flawlessly. I also installed all necessary apps and programs that will remain permanently on my machine, like security essentials, afterburner, asrock tuner, etc. Everything else, including games, documents, music, are being thrown on a WD 1TB Caviar Black on SATA3.
The Caviar Black compared to the Vertex 3 my windows bootup time dropped from 35 seconds (from BIOS to desktop) down to 14 seconds!!