They're all a bit weak when it comes to caps, at least by default. WASD has a ton of cap options to play with, but none of them are high quality, far as I know. Cooler Master's legends look lame and their keyboard bodies tend to be covered in a rubberised finish, which is unfortunate. Filco makes a fine board but the MJ2's weak point is definitely its caps. They do front printed legends for good reason: touch them and they will wear off. Doubleshots are immune to all that.
In any case, you'll notice the upgrade when you (eventually) get your Round 5s! They are literally huge, and hands down my favourite ever caps.
I've got a set of Round 4 SPH here on a Ducky Shine 3 that I like a lot. (Won it as a prize, no less!) The backlight is effectively useless with doubleshots:
I don't mind, as I much prefer the fancy caps. You can disable the lighting quite easily, although I actually leave reactive mode on for a firey glow like above! The only key that behaves differently is caps lock, if enabled. I run OS X, and when I disable it (which is my preference) the LED never lights. Its state is controlled by the host computer.
There are a few keyboard models here and there that come with better caps. Ducky has the Premier with dyesub PBT coming out. One step down is that €99 "black mamba" Imbattable mentioned with engraved PBT caps. Filco even has its own version of Round 5 caps (same profile, made by SP) that I can't remember the name of. I don't know what CM is up to in the fancy caps stakes, though their Topre-switch NovaTouch sounds like a great option for putting Round 5s on when it comes out…
Anyway, definitely look around. Filco, Ducky, WASD and CM all make solid keyboards and are worth a bit of thought. You can read far too many words about my Shine 3 right here, if you like:
http://deskthority.net/news-reviews-f4/ ... t7130.html