I simply could not stand blue. All mechanical are louder than regular keyboards, but blue is just extremly loud in my book.
I havent tested any blue switches keyboard except the Blackwidow (wich is considered by programers as a bad keyboard, especially in terms of durability... thou there is no guarantee that any model is fail proof), so i did not feel like giving my opinion on those switches.
I know that Progamers try to get a FILCO (i wanted one myself, but could not find one in Poland), and then choose switches from there. Black are stiff. Normally id say too stiff for playing, but i actually like them due to how the feeling is regarding feedback whenether you did press a key or not.
(Note that the steelseries 6Gv2 is PS/2 compatible, so you can use it if you feel like it, just test it well before you decide: I have to use both mice and keyboard in PS/2 or USB, if i mix them, my keystrokes are too fast for my mice to register correctly, and i end up producing from 1 building only instead of 5).
If you dont want a stiff keyboard, you should aim for browns.
Reds are mostly for 1st person shooters.
This is becouse the weight of your fingers is enought to keep the key pressed (not joking here) so you wont get tired from 8+ hours of holding the "W" key or the shift key with your little finger.
However, in sc2 or broodwar, that means you will more likely press more than 1 key with your fingers, so its a no go.
There is a secondary issue and that is keybaord size.
You should try to get a keybaord that is not to big (so your hand does not have to travel to far from one keystroke to another), and that has relativly big spaces between keys (to avoid multiple keystrokes).
From the keybaords that i could buy in Poland so far only steelseries 6Gv2 fits all the criteria.
But i probably would rather have a DAS or a FILCO keyboard, its just i dont have a easy way to get them (or a hard way also).
Also, try to be carefull with mechanical keyboards: Few of them are actuall liquid spill resistant (hail to my G11 that has survivied multiple beer and cola spliss and never even flinched).