I'm running the Asus M2N-E AM2 model here about to see 4gb rather then 2gb of DDR2 800 memory. Newegg should see that for less. But the Asus support doesn't list Vista only as new as XP for drivers there and on the software disk.
I will state that the board in now here was the second after the first quit following 3 days use. Newegg readily shipped the replacement right out when that was returned. The main thing is what model cpu will be run on it? For a Phenom going with an AM2+ would be a thought especially if Vista is the version of Windows.