I have been running my SSD for several months now and love it. I got this one:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227394I am running my OS (Win 7 x64 Ultimate) w/ programs installed on the SSD.
I have the Swapfile on a second standard drive (partitioned so the Swapfile is at the BEGINNING of the drive). Also the USER folder (documents and settings) are also on the standard drive.
This keeps the writes to the SSD low. By placing the Swapfile at the beginning of the standard drive, increases speed. Keeping files on the standard drive allows me to reinstall Windows without backing up the files (although they are backed up on another drive as well).
The SSD is EASILY the best thing I've ever done to increase performance of my computer. Startup times have been cut in half (or better). Programs open WAY faster.
The cost has really come down. If you've got the bug to upgrade something it's the best bang for your buck (IMO).
If you're not running Windows 7, I would suggest upgrading as well since it supports TRIM.