Most burners nowadays will read anything, i'd say the choice is up to you. Just make sure you got a dvd burner thats compatible with the choice you make.
Yeah, about that, I'm not really sure. It's dual channel, so it's twice as fast as what the single stick is? I will have to look it up using Sisoft Sandra, the PC builder said he got the fastest ASUS memory (2x512) in dual channel that runs at a total of 1 ghz.
EDIT: I see 2x200mhz, is that per memory bank? That would be a total of 800mhz for the two sticks. The front side bus for the board is 4x200 which is 800mhz.