im happy with both the components you mention, the cooler keeps the 2600k under 60c at 100% folding load and the case is a case, all my cables are managed and out the way. :/
Well, I don't know why you're looking to upgrade then. There's really nothing else to upgrade unless you want to get rid of that PSU (OCZ PSUs are terrible) or grab a high quality sound card and some really nice speakers.
I have to agree, the only thing that i can see missing from that rig is a decent soundcard, I didn't think a soundcard made that much of a difference but I was pleasantly surprised (and at that, I only got a lowend one).
If thats your current system and you're looking to upgrade because you simply have too much money, buy yourself a nice car, or perhaps donate something to a charity.