Quick Memory Question (DDR2-667 vs DDR2-800)

Hey everybody, I am currently picking out my parts to my new system and want your opinions for I am not a genius with computers.

First off, I was going to get DDR2-800 Corsair memory shown here until it went out of stock:

http://www.newegg.com/Product/Produ...N82E16820145590

So now, I am torn between whether I should get Corsair DDR2-667 memory or get G.Skill DDR2-800 Memory.

http://www.newegg.com/Product/Produ...N82E16820231087 – G Skill Memory

Here is the motherboard and Processor that I will be getting, Both are Intel:

P - http://www.newegg.com/Product/Produ...N82E16819116240
M - http://www.newegg.com/Product/Produ...N82E16813121289

First off, Is it worth getting DDR2-800 with those boards and also, I notice that the processor is only 1.25-1.4 Voltage – Is that bad?

All opinions welcome, please help

Transferring to General Hardware…

none of the links work for me