Thank you for all the input.
BTW: Fenderbass-I am a bass player, too. Nice to meet you.
If I don't put the SSD in the primary spot, I will lose the benefit of SATA 3, so I shouldn't go with one of the hot new SSDs like the Vertex 3.
Why not replace the default 5200 drive with your SSD? That's what I'm planning on doing.
I intend on using the drive for apps, the OS, and my audio and MIDI files, and everything else. Unless of course I end up getting an SDXI for the OS and apps or for the audio files. Though I wonder if SDXI can benefit from TRIM support (which seems not to be an option there, at least ATM).