DDR2 RAM speeds for Q6600 build?

[ZombieRitual]

With the July 22nd price cuts in a few days, I'm almost done finalizing my build. This is what I have so far:
Q6600
ASUS P5K LGA 775 Intel P35 ATX Intel Motherboard - Retail
http://www.newegg.com/Product/...p?item=N82E16813131180
SAPPHIRE 100186L Radeon X1950XT 256MB GDDR3 PCI Express x16 VIVO HDCP Video Card - Retail
http://www.newegg.com/Product/...p?item=N82E16814102067
Western Digital Caviar SE16 WD5000AAKS 500GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM
http://www.newegg.com/Product/...p?item=N82E16822136073
ENERMAX Liberty ELT500AWT ATX12V 500W Power Supply - Retail
http://www.newegg.com/Product/...p?item=N82E16817194003
LITE-ON 20X DVD±R DVD Burner with LightScribe Black SATA Model LH-20A1L-06 - Retail
http://www.newegg.com/Product/...p?item=N82E16827106072

One of the things I haven't decided on though is what kind of RAM to get. I will definitely be getting a 2x2 GB pack of DDR2, but I don't know if I should go with DDR2-667, DDR2-800, or DDR2-1066. I don't plan on overclocking, I will be getting Vista x64 (probably Home Premium), and I don't really care what brand so long as it's a recognized name (Corsair, OCZ, Kingston, Patriot, etc). I just want to make sure that I don't spend more than I need (as value ram is ok) and that it's compatable with my motherboard/cpu.

So what RAM will serve my needs?

 

[BenchZowner]

Crucial Ballistix DDR2-800 ( PC2-6400 ) should be more than adequate for you and even cover you up in the future if you decide to try overclocking as well.

 

[ZombieRitual]

So going with DDR2-800 won't pose any problems for me?

 

[BenchZowner]

Not at all.