Memory for 8gigs Asus Maximus Formula / Vista 64 ?

Which memory should I use please for 8 gigs worth on an Asus Maximus Formula motherboard. I'll be running Vista 64 Ultimate.
CPU will be Q6600 (Go).
I'll be (mildly) overclocking the CPU (on air) and only touching the memory if necessary.
I would like to have 8gigs worth. The Asus venders list shows I can use 667 I think if I want to go to 8 gigs.

If I want 8gigs worth - what memory do I need please and can you post a link to some decent product examples I can research.
(I noticed the Kingston website suggested I could use just about any of their products in any slots up to 8 gigs, but I'd like an opinion from a fellow user or abuser).

Much appreciated dudes!
Grant.

Thanks. Do you have the same setup by any chance?

(I read about 6 pages of reviews at newegg and a fair few people are running 8 gigs happily but only one user happened to mention an `Asus Maximus' - which ever one that refers to.)

Cheers.