1.5v DDR3-1333 is supported in overclocking mode, if cpu is running on standard FSB1066, then it will run as DDR3-1066.
I would just buy cheaper DDR3-1333 rather than expensive brand, as you will see no real difference.
For example, ebuyer.com has your 2x4GB @ £40.38, while 2x4GB Crucial @ £29.18, both excluding delivery.