Asus M2M-E Memory

[Brutal]

I've recently bought this board but still undecided on what memory to buy. I'm going for PC5300 667 and looking at 2x512mb sticks. I've got the QVL for memory but I'm still not sure what to go for as I've read even some on the QVL list are prone to problems. A friend recommended:

Geil 1GB 2x512mb (GX21GB5300DC) (MY-030-GL) but this is not on QVL.

I was also looking at either Corsair or Crucial.

Also i know that buying 2 sticks will enable dual channel but whats the increase over a single channel on this DDR2 m/b?

 

[Brutal]

Just noticed this on offer

GeIL 1GB (2x512MB) PC6400 800MHz Ultra Low Latency DDR2 Dual Channel Kit (GX21GB6400UDC) (MY-057-GL)

The CPU I have is a Athlon 3500 AM2. I know most recommend 667 for this processor but will 800 be worth spending a little more?

 

[Brutal]

Thanks for your replies. I'm going to go with Geil DDR2.