What type of memory I can use for ASUS M2N32-SL motherboard?

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I currently have the ASUS M2N32-SLI motherboard and I have around $450 set aside just for memory.
LINK: http://www.vr-zone.com/?i=3662

I am building a MONSTER PC.

I just bought 3 500Gig SATA hard drives.
I also just purchase two EVGA GeForce 7950 GT KO SuperClocked / 512MB GDDR3 / SLI / PCI Express video cards.

Please let me know what you suggest.
I am definitely considering OCZ but I have 16 Gig of ram that I can put on this motherboard and only around $450 to spare on it.

Any suggestions will be appreciated it.

 

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Yeah, most likely I will end up getting VISTA enterprise next year when it comes out.