Hello, I was planning on building my first rig from gaming sometime this year. This is what I have planned out...
CPU: i5 3570k
GPU: sapphire Radeon HD 7950 3GB
MEMORY: GSkill Sniper Series 8GB (2x4GB) DDR3 2133
MOBO: ASRock Z77 Extreme4 LGA1155 Z77 HDMI SATA 6gGB/S USB 3.0 ATX Intel Motherboard
HDD: ??? (Something cheap)
CASE: DIYPC Alpha-DB6 black Acrylic ATX bench case
Any suggestions on how to make it better? I don't know if I should get a nVida card, better CPU cooling, or a closed case. I want to spend less than 900 but I'll go above if it makes a big difference. Sorry if this is noobish, I'm new to this.
Most people will say that Raidmax is a very bad choice for a PSU. Seasonic, Corsair, XFX, PC Power & Cooling, and Antec are generally considered far more reliable. Make sure to get a Bronze 80 Plus as well, and you should only need around a 600w PSU for the entire build.
You'll also probably need a CPU Cooler if you're actually going to overclock. I realize the build isn't actually inside a case... though if you're planning to submerge it in oil or something to keep the whole thing cool, I suppose that wouldn't be necessary either.
Crossfiring should have at least a 700-750w PSU. More, if you're using older cards.
I only mentioned the submerging bit because of the 'case' you're getting. Since you're not using an actual enclosure (or rather, an actual PC tower case of some sort), I'm not really familiar enough with the kind of cooling you'd need for overclocking. You could potentially put an industrial fan nearby and have it blow on the whole thing and it could help keep it cool as well as any cheap liquid cooling solution (don't quote me on that, since I've never tried anything of the sort).
However, for overclocking, you typically need something more than the normal CPU cooler that comes with any given CPU. If you go with air cooling, a Cooler Master Hyper 212 EVO would probably be a good, and cheap, solution. You could go with water cooling, but you'll want to wait for someone else to help here. I'm not familiar with it.
You get a good case for air flow (HAF 912), a PSU you can use to crossfire in the future, a Radeon 7870 video card, a 1TB Seagate HDD, the 3570k with a z77 mobo and a Cooler Master Hyper 212 EVO so you can overclock, 8GB RAM (all you really need for the foreseeable future)... and although it comes in at almost $960, that's before rebates. After rebates, it's only $898.
Keep in mind that you may be able to bundle some of these components on Newegg, or you could find a cheaper version (especially of the mobo, but the Extreme4 is so highly reviewed that I figure it's worth the cash).
You could overclock the 7870 to possibly match the 7950. If you decide to do so, let's see... I'd suggest getting a different 7870. Get the MSI HAWK edition, it's factory OC'd to begin with, so you can OC it even further. It's more expensive than the XFX Double D Black Edition that's part of the listed build, however, by around... another $20-30 or so.