I'm not running that board, but I can give you some general information concerning ram.
1st, you can run PC2400 or 2700 on your mobo.
I think that Corsair make the best memory available, and since I bought my 1st stick, I won't buy anything else. Yes, it's expensive, but it works well, and overclocks better than the others, in every review I've read.
As far as how much? The more memory you have, the less FSB you will get. As well, the amount of actual chips on the memory boards make a difference. The less chips the better. In other words, it's better to have a 256 Meg memory stick with 8-32Meg chips on it than 16-16Meg chips.
Lastly, I believe that you will get better memory scores from 2X256Meg sticks than 1X512Meg stick due to the ability to make use of the Interleaving available in the bios.
I hope that this information helps you out.