I'm getting a new i5 rig which i will use mostly for gaming, photoshop, surfing etc.
This is what I was aiming for:
Intel Core i5 750 2,66GHz
CoolerMaster Hyper 212+
G.SKILL 4GB (2x2GB) DDR3 1600MHz
HIS Radeon HD5870 1GB
WD Caviar Black 640GB, 7200rpm
Antec BP550 Plus 550W (There was a discount for it, otherwise i would go with vx550w i think..)
CoolerMaster Storm Scout Black Steel, Mid Tower
I have a 24" LG monitor with 1920x1200 resolution so I think that the hd5870 will do a perfect job for 2-3 years or so. I'll probably add a SSD as a primary drive when the prices lower a lil' bit.
I also intend to OC the CPU to 3,6 ~ 4,0 GHz since i had my old one @ 3,6 with stock cooling and 68 at max load.
All looks good, but for the CPU Cooler I would go either with an expensive Noctua or a XIGMATEK Dark Knight. Also get some 3rd party thermal paste, e.g. OCZ Freeze. For the motherboard I personally would go for a Gigabyte P55A Motherboard.
I thought Megahalems would look good too. I have Arctic silver 5 paste, and about the motherboard, well i could slip in a gigabyte's too, but they probably have the same or nearly the same oc capabilities.
Nothing wrong with a hyper 212 plus, here's a review of it http://www.frostytech.com/articleview.cfm?articleid=241... unfortunately it doesnt compare it to the Noctua NH-D14, but as you can see by comparing it to the Xigmatek DK-S1283 on the chart, it is very similiar in performance and probably not quite as expensive.
I've got no beef with your mobo selection.
The voltage need for a CPU to OC differs from Chip to chip so no way to tell what yours will do. Even default V is different from chip to chip.
Best I can tell you is that 99% of i5-750's will do 3.6ghz at 1.3v or less. Above that it's very chip dependent.
Cache size has no impact on a HD's performance. HD performance is more important than you think.
Even click on a program or app and nothing happens for a sec or 2 and you wonder if you actually clicked it? That's HD related.
Boot speed, load speed, how fast programs install are also all HD related.
If you've ever used a netbook and seen how slow they are, it's largely HD related. Slap an SSD in your average netbook and they're as fast as a iphone (well outside CPU intensive tasks, but iphoens can't do those either).