I know that the Samsung 250 evo is the best and the Samsung 120 evo drops way off on the write so is there a 120 GB SSD drive out there as fast as the read and write of the Samsung 250?
Well what are you using the SSD for? If you're just using it for an OS boot drive and a few programs you don't really need crazy fast write speeds anyway unless you plan on writing a lot of stuff to it frequently. The speed difference is about 20 percent. I've got the 120GB 840 Evo and it's pretty damn fast. I do wish I'd waited and got a 250GB though because it's more than half full with just an OS and a few smaller programs.