will pass with flying colour.
but i think ultra in sc2 is overkill for the eyes. most will just make it less shiny for long playable time

For Ram why not get 2x4gb since it is so cheap now to make sure ur system is fail proof for other games as well.

i gonna be the over confident prick so here it goes as i read too much reviews before i upgraded my system for hots:

7770 is a good bang for money also one of the best budget gaming built card, yes screw gtx650!
When you have the money in future you can always sell it off and get a stronger card, Graphic cards prices are dropping with the R7 series war with Nvidia. So you wont lose much.

If you are only gaming sc2 that only uses dual cores, any i5 is already overkill gaining maybe on the cache level hardly noticeable unless you enjoy loading up first and scream wood pc for the late loader when game starts.

your first built should runs sc2 in ultra 1090p for above 30 fps on 3v3 full orgy with no stuttering at all. If there is one card that will hit the sc2 top but not overkill it this is the card!

(all this assuming you are not going to stream your game on twitch TV and you are running a single monitor and also as 4 Gig Ram goes, i also assuming you are not multitasking a lot of other things behind sc2, yes 4 gig Ram is all you needs to run almost all games in the market now)

have fun

-.-
stick to your budget and just buy it, every little cents throw in a pc will always make it better be it playing old or new games.

thumb rule building a GAMING pc is always to squeeze as much as possible at the graphic card and minimum for the rest.

later on when u starts to have more money, get a good monitor and SSD.
further down the road get mech keyboard and better mouse or headset. <--this is poison