Help with New Build - Overclocking C2D

I am trying to build a higher end system to do the following:
Video Editing
Photo Editing
Gaming

This is what I have so far, but I need some help selecting a case and PSU.
I would like to try to overclock, and I'm not sure if I will need any additional fans, or coolers as well.

CPU - C2D e6400
MB - Gigabyte 965P-DS3

RAM - It's a toss up between these, although I would like to try to get something a little less expensive. Will all work with this MB?

Corsair XMs2 PC800 5-5-5-12 -http://www.newegg.com/Product/Prod [...] 6820145590
Corsair XMs2 PC800 4-4-4-12 - http://www.newegg.com/Product/Prod [...] 6820145034
Super Talent PC800 4-4-3-8 - http://www.newegg.com/Product/Prod [...] 6820609026

Does 5-5-5-12 work with this combo and OC?

GPU - Saphire ATI 1950XT - http://www.newegg.com/Product/Prod [...] 6814102067

I like the price of the 1950Pro better, but from what I read, the 1950XT is the way to go, although this one only has 256MB of RAM.

Thanks for any help you can provide. I appreciate any insight.

If you're not that serious about overclocking, I wouldn't get the cas 4 ram as its very expensive. Pretty much any of those ddr2-800 sticks will be fine though. I use this Mushkin ddr2-800 on a similar setup and I think its one of the best deals right now for ddr2-800. Heres a link to a review of that ram: review link

DX10? Probably not. A better cpu? Yeah.

An extra +12v rail that you plug directly into the card, just like most highend cards. Other then that no.

That Super Talent ram is the way to go. Depending on how high you want to go, you should get an aftermarket hsf, the scythe infinity is a really good cooler, you should be able to hit 3.0ghz with your E6400.

Thanks Guys. I also like that case, so I will probably go with that. The Super Talent has one of the highest review ratings I have ever seen for any product, so I am sure that is great as well. I am just wondering if I need something that good, or if I can OC with something a little cheaper.

As for the PSU, are than any recommendations on for something that would be dx10 compatable in the future and not overkill for today's needs? It will probably be 1.5 - 2 years before I upgrade if I go with the 1950XT, however if I went with something less capable now, it may be sooner.