What about the Other World Computing SSD?
50GB Mercury Extreme Pro RE SSD 2.5" Serial-ATA 9.5mm Solid State Drive. High Performance internal MLC Flash storage with 28% Over Provisioned Redundancy. 5 Year OWC Warranty. (OWCSSDMXRE050) http://eshop.macsales.com/item/Other%20World%20Computing/SSDMXRE050/
$209.99 each, seem to have good reviews and performance. Using the SandForce SF-1200 controller with 28% "extra" space so you could fill the drive to 50GB capacity and still have 14GB left for moving stuff around to avoid performance or wear issues.