Today I'm going to go to Microcenter and pick up my i5 and motherboard, the last piece of the puzzle will be memory. My issue is that Microcenter doesn't carry G.Skill memory, which is what I usually use. I could order it online and wait a few days to get it, or I could pick up some of the memory they carry and build my system today.
I find it interesting that they have the 3gb and 6gb version of the OCZ ram I listed, but not the 4gb version on the compatibility list. They do have the Corsair XMS3 ram listed, but the voltage and timings are higher than the OCZ.
The RAM on that board comes in trips instead of pairs - so most do list 3 x 1GB and 3 x2GB sets. The OCZ Gold have the better timings so if you are sure that one is on the list with that manufacturer number I would suggest going with 3 x 2 GB of it. Look for the set of three and make sure those numbers match.