Corsair, OCZ, Gskill, Kingston, is the main ones, but it you are looking for Speed Intel 510 is the one you are looking for, its the one of the best SSD on the market, it is more expansive than others. other than that they mostlikly uses same controller chip, so its all about the Brand name, I do prefer the OCZ or Intel for SSDs, but i heard that Crucial M4 is a worth a look as well, you can get them from
PCCaseGearI have 120GB and use just for the OS and some Application, make sure to move all the User data to a HDD otherwise it gets full very very quick.
GTO