I went with the ASrock Z68 Extreme 4.
Why did I go for this motherboard? First, it has largely positive reviews/response everywhere I look whereas I couldn't find any feedback on the cheaper gigabyte board at all besides a few "rants". Second, the gigabyte is a little tight on sata ports since I have 4 HDD's, a sata optical drive and the SSD drive. Lastly, the gigabyte mobo has a 4 pin CPU power adapter, and the ASrocks 8 pin adapter will probably serve me better with regard to overclocking.
ASROCK Z68 Extreme 4 vs Asus P8Z68-V PRO Z68:
It is an extremely close call since both mobo's are of high quality and highly recommended.
Factor in tomshardwares comparison review:
http://www.tomshardware.com/reviews/...3,2939-18.html
For £10 less, the ASROCK Z68 Extreme 4 is the better deal IMO.
I do hope this helps someone decide which Z68 mobo to go for. I spent a lot of time researching every detail to come to this conclusion. If you are insistent on getting a Z68 board and need the extra SATA ports/PCI-e slots, go for the ASROCK Z68 Extreme 4