not to poke holes in something you are going to buy in a couple days,, but the antec 1200 is a monster of a case -- you don't need to worry about going low profile for anything.
to be honest if you are looking for quiet with that cooler, this is not the case for you, you may want a coolermaster cosmos (only a little more cash) or a silverstone raven - depending on model, it will be similar in cost to a 1200 or a cosmos, with or without side window, and looks sweet as hell
^^ the silverstone case you mentioned is one of the raven series i suggested,, there are like 6 different models of raven, any of them are awesome and unique.
the 580 isn't that power hungry, however the 1000 psu would be recommended if you plan to SLI later
60GB is tight, but doable if you manage your programs effectively, I would just add storage (green drives) at this point and not worry about another ssd till they come further down in price, you'd probably be able to live with it till then -- i am sure the 7200 rpm will be just fine overall for some of your lower end games with less level loading,, ,most of the ssd "snappiness" is on your OS & supporting programs (browser/media players/pdf readers/office type programs)