SandForce, Micron/Crucial, even new Intel-Controllers. Anything that saturates the SATA-II interface in my Mini. At the moment SandForce is to prefer, as it has a faster write speed - even if you go 256GB. When the SATA-III drives hit the market, anything that "only" saturates SATA-II will be a bargain.Well, you didn't specify that you wanted a 120GB Sandforce SSD for under $200. The Western Digital uses a modified JMicron controller. Its speed and IOps/sec are lacking compared to the Sandforce crew.
The RealSSD is already $30 cheaper than the SandForce-1200 drives, it's only a matter of time, until you get the same or better as the current OWC one, for under $200/120GB.