New Build - Motherboard / Memory / GPU Advice

hi guys,

i've started purchasing my pc parts and am looking for some help deciding what motherboard and memory to buy.

so far i've bought:
1. case: NZXT phantom
2. hdd: 3tb western digital green
3. ssd: samsung 840 series 250gb
4. psu: cosair ax850

need to purchase:
1. heat sink: Phanteks PH-TC14PE CPU Cooler
2. cpu: Intel Core i5-3570K 3.40Ghz (Ivy Bridge) Socket LGA1155
3. motherboard
4. memory
5. gpu

Aiming at a black and blue theme.

MOTHERBOARD
could you guys please advise me which is the best motherboard for around the £150? (guess the maximum i would want to spend is £200) The options I was considering were:

- Asus P8Z77-V PRO Intel Z77 (Socket 1155) DDR3 Motherboard
- Gigabyte Z77X-UP4 TH Intel Z77 (Socket 1155) DDR3 Motherboard
- Gigabyte Z77X-UD5H Intel Z77 (Socket 1155) DDR3 Motherboard

i'm not sure if £150 is the right price for a general gaming pc.


MEMORY -Cosair vengenance low profile 8 or 16gb


GPU - maximum spend £300
Gigabyte ATi Radeon HD 7950 Windforce 3X 3072MB GDDR5 PCI-Express Graphics Card

I would really appreciate any advice you have and happy to consider any alternatives you can suggest please. Really could do with the help!!