Gaming won't often see a big difference with ssd's, they can, some games page a crapload or constantly load textures and you can see a difference, often in the minimums, but not many games would show a noticeable difference. Faster load times can certainly be the case but it depends on the game, depends on why the load times, some load quickly but do a lot of cpu work generating environments or doing other crap. Some games load on the fly in a very efficient way(just cause 2/skyrim) and some load on the fly like crap and would benefit a lot.
SC2, can't see it making any real difference, also keep in mind that most people including me will install a few key games on the SSD, and most games on a normal hdd anyway simply for the sake of cost. I would without any doubt recommend a ssd for OS drive anyway, its just nicer, everything will load faster, windows will be more responsive, doing more than one thing at once will be more responsive, ssd's are awesome, for gaming alone, I wouldn't recommend one specifically, but any benefit you get from gaming you'd get anyway when you get an ssd for "general" use anyway, which everyone should.
