I have very successfully moved Log files to a SSD system (*) and received huge (2-5) times improvements in speed. I'd have thought moving the Log files would be more benefit than moving the TempDB.

SSD system, was just a couple of 128GB SSD's in RAID 1, quite cheap and the performance gain was fantastic.

Also looking at what you looking at doing, 10 tempdb files on one SSD, up to 1 TB, must be behind, is there a 1TB SSD on the market?

And do you really want to put any DB on a single drive, I'd want to RAID it somehow.