Intel Core i5-3570K 3.40GHz (Ivybridge) Socket LGA1155
ASRock Z77 Extreme 4 S1155 Intel Z77 DDR3 ATX
Sapphire Radeon HD 7850 2048MB GDDR5 PCI-Express Graphics Card
XFX Pro 650W Core Edition '80 Plus Bronze' Power Supply
Cooler Master Elite 430 Windowed Case - Black MF CODE [RC-430-KWN1]
LG Electronics 24x DVD-RW SATA Black
Western Digital 1TB Black 3.5" SATA6GB/S 7200rpm 64MB
Low latency is good, and those kits all have the same nominal bandwidth, so I suggest you go with the first one - it's tied with the third for timings, but the low profile means it's less likely to interfere with large cpu coolers in case you decide to get one.