I bought the i920 (There's no need to waste money on the other chip variants) to OC to 4.2 stable, 12GB DDR3 XMMS, and originally purchased an Asus P6T but after the first RMA because it wouldn't post past 8GB, and the second RMA due to a DOA, I ditched Asus for the eVGA X58 SLI board which has ran rock solid.
I haven't had a good experience yet with SSD (yes, I avoided JMicron/Intel controllers), so I raided two 1TB drives together and put Arma into a virtual ramdisk with about 3GB left to spare. Running Win7 64bit Ultimate stable for about 1 week now, and map loading sure is instantaneous for Arma. ;)