well this is too relative, first of all the game should be released first to check what will be it official graphical capabilities.
also, what resolution are you planning to play it? for low resolutions that card will probably get very very high settings but for high resolutions you may need to lower graphics a little what is your screen resolution?
About brand this is not just about brand, it is about the cooling solution, if you take a reference card the brand really doesn't matter, if you take a custom card (with overclock/custom cooler etc) than you must compare wich one have the better colling solution and better default clocks if you don't plan to overclock it.
but really about if it will run at maximum settings i can just be sure when the game is finally released the beta may not be with final graphics, but probably yes that card will handle ultra settings or at least close to that with resolution <= 1080p.
Yeah, I want to run the game on highest resolution.
is it 2560 X 1440 right now?
I mean at least 1900 X 1080.
but that depends on your monitor screen size... you can't go over that, normally it is 1920x1080, it will run great on that resolution, but i'm not sure of how heavy the graphics will be so i can't say for sure you will be running at ultra, but will be close. if you have a 2560x1440 monitor and wan't to run in that resolution you will probably need to lower some graphics, but will also work.
yes like i have said it is not possible to know that for sure, but i can bet that you probably will be able to play on high settings even at 2560x1440 resolutions, by the videos and the configs it requires to run the beta.
well i didn't played thje game yet ando also it is in beta so there is no way to know, maybe that performance is not good because the game is beta, they will probably improve performance when it is out of beta...
it is not something wise to build a computer based on something that is not out yet because of that, what i can tell is that starcraft 2 will work very well at that resolution.