I dont know how great OCZ power supplies are, but if they're anything like their RAM I would get something else. A Corsair TX650W PSU is only like 10 bucks more and then you know you get top quality. And also, get a Samsung Spinpoint F3 instead, almost no price difference and you get a faster HDD. I myself have both a Corsair PSU and a Spinpoint F3 and im really happy with them. As for the Case, you might wanna look into an Antec Three Hundred instead. again, almost same price but you get better quality. the Antec three hundred is all the rage here on Toms Hardware and my friend has one of them, he loves it.
As for compatibility, all those listed thing would work together, but id throw in a few bucks more and get those things I listed.
1. For OCZ PSU: ModX rather than StealthX as the latter is not 80+ Hmm if u in UK i'd hit a nice Be Quiet PSU hehe
2. Ya dun go with the Eco Green
3. These RAMs? http://www.ebuyer.com/product/179278
4. Hmm perhaps state a budget so we could help ya out better ^^