BTW, got my OWC 240GB SSD. It's fast, but I'm slowly realizing that the 16GB of RAM really did more for my workflow than the SSD has done. Need to decide for good ASAP before the OWC return window closes!
IMO, RAM will definitely give more bang for buck than an SSD, as RAM prices are (relatively) cheap vs SSD prices which are still somewhat high.
Best to upgrade RAM first, and then if you find you still need it, go for SSD.