Just bought a ML10v2 + 1TB from warehouse1 at ~$199 (no pick up stock at 169), did a bit of reading about OS and it seems that with FreeNAS 8gb minimum is now required. Last time deal was posted on compatible ram it was Kingston at around $60, but this is compatible and works out to be ~$55
Compatibility listed here http://www.crucial.com/usa/en/compatible-upgrade-for/HP-Comp…
That's a fantastic price if compatible. I bought this server when it was $99 and followed RadioBirdmans suggestion https://www.ozbargain.com.au/node/255264#comment-3820154 of putting expenology on it. With 4gb it runs really well with the 3x3tb hard drives I have installed. The only criticism of the set up is that the fan is a tad noisy.