A gaming machine these days relies on the video card. Don't think that the fastest CPU out there is going to get you "better" frame rates. It might well give you a few more, but you're not going to need the difference between a 2500+ and a 3000+, and CERTAINLY not for what AMD wants to to pay for it! Get a 2500+. Even without overclocking, you won't miss the speed difference . . . Don't feel pressured to overclock anything. As you have no stars under your name, I can only guess you're a newbie. If this is the case, focus your attention on getting the system together and working. Overclocking comes later. But it's important to buy good parts. If you decide to overclock later, you'll thank yourself. If you don't decide to overclock, then you just get a "better" system to play with. What you need is a good video card for gaming. So go with a 2500+ and save the money from that and get a Radeon card. The 9600Pro is a good card (not the non Pro) but, again, you'll have to overclock that to get great performance, and that's not the objective at this point. Spend the money you saved on a 9700/9800. They're very overclockable, and you're guaranteed to get better performance than the card you were looking at and the 9600. Buying a 9500np these days is a pretty big risk, since most of the ones that were soft-modable are gone (that's my opinion . . . I haven't seen too many people get good cards recently). I think RAM is a very subjective thing here. Some will tell you to get one brand, others another. Ultimately, though, you can't argue about brand, so long as it works. I'll tell you right now, there's Centon RAM in my computer right now, and it works just fine, and I've never even heard of Centon. Don't buy no-name, but don't go spend 500 dollars on RAM, either. Crucial, Mushkin, Corsair are all good brands. If you're not overclocking, don't be taken for all the righteous-looking heat spreaders and such. All you need is RAM that will take aggressive settings. The RAM you've got is fine. It'll work well at aggressive settings at 200MHz+, which will work fine with a 2500+.
So get:
2500+
same RAM
9700 (save some bucks, since sooner or later, PCI Express cards will come out, and what you get now will not likely work in your next machine).
Case is totally up to you. So long as you like it, get it. Worst case is that it'll weigh a lot, and then it's just less fun to take to LAN parties . . .
I've not heard anything one way or the other about the Vantec. I really like the SLK-800, but it's expensive. The SK7s will work fine in duallies, and considering the difference in heat output of a duallie, it'll work just fine in a single setup, so consider saving a few bucks over the SLK-800.
WELCOME TO THE FORUMS!!!
Z