Just go Mushkin Atlas Enhanced. Then you could always ram cache with the ssd...or to the 5,300rpm drive.
Screenshot 240gb Atlas MSATA SSD left. turd ball 5,300rpm drive on the right using ram caching. This was just a single run. Not to bad.
Also note that was a clean image install off recovery dvd's and i just clicked whatever setting up the ram cache to get it running. Nothing is optimized because this is not my pc and i was just testing some new ram in it and had it on hand so i figure what the heck i'll just show you you what i mean.
And when loading wow on the SSD with no ram cache vs a 5,300rpm drive with ram cacheing i was timing the load screens and they were about even give or take 1 second. Some times the SSd was a second faster some times the ram cached 5,300rpm drive was. Not a SSD replacement but cheap alternative to keep a give drive and give it a bit more umph.
Pic of the benches.
http://i1216.photobucket.com/albums/dd370/ogeanog/IMG_20130704_042852.jpg