your computer case link is the corsair memory link
but from the way it sounds, if your case has 4 fans and you don't plan on overclocking that case will work just fine
the two main concerns for temperature are cpu and gpu but with that gpu which has 2 fans (like my gtx460 1gb) it should cool itself down enough that even in a poorly ventilated case you wont have problems
as for the cpu, i have the exact same cpu as you would get and trust me it's an awesome cpu. i have it at 4.07ghz right now on air with a zalman 9500a (i would suggest a better cpu cooler if you plan on overclocking that high, i hear the corsair h50 works good)
i have a cheap $55 computer case though (coolermaster elite 334 nvidia edition) and it only has 2 120mm case fans which work well enough to keep the overall computer from overheating.
you only really need a 550w even if you plan on adding 3 7200rpm hdd's as i have 2 7200 rpm hdd's, a gtx 460 which is overclocked, and an overclocked 965BE with only a 500w psu.
http://extreme.outervision.com/psucalculatorlite.jsp if you want to find out the exact psu requirements