im clueless, is this ok?

[Knytestorme]

They have Thermaltake cases, in fact this one might even be better then the shark, don't even have to open the case to add a HDD lol.

http://www.pccasegear.com/index.php?...ducts_id=15189

Not the cooler I suggest but about as good:

http://www.pccasegear.com/index.php?...ducts_id=17015

They have the MB I suggest:

http://www.pccasegear.com/index.php?...ducts_id=16815

The power supply I suggest is available world wide.

Which is all cool Sam, but if OP is looking at an ebay machine for $599 I think suggesting a mobo that's almost 50% of that price is not really going to help them tbh, or is adding extras like a $90 fan when the stock fan should make do (and tbh if I was going to add cooling to it I'd go with something like the 620 Kuhler for $95).

Having seen the edit the OP made about having a budget of up to $1500 then I'd make some changes to what I recommended but I really don't see anything that will make a major difference to their boxing experience if they are only looking at max 5-boxing.

[EDIT]
Fixed links Sam, thanks for pointing out.

I really would rahter see OP spend a little more on upgrading to on of the gigabyte Z68 mATX mobo's and spending more money elsewhere than on case/cooler as I don't think those will add anything to the experience in a noticeable manner compared to moving up to a 3Gb 580GTX for instance.