Xpenology is perfect for this small server. No need to add more memory.
I have 2 HP N40L running Xpenology, what I like is about HP is living room quiet, they are actually located in the living room next to my sofa. It holds 6 drives, and fast enough for Xpenology.
Purchased HP N54L from Tigerdirect this morning, $180 - $25 PayPal discount = $155 free shipping , No CA tax.
Cheaper than I could build it myself. I have 2 other HP microserver, using it with Xpenology as backup server.