I couldn't wait any longer for more RS480 boards to show up, so I ordered a MSI RS480M2-IL for my HTPC, and Fedex guy just dropped it off.
I plan on dropping it into an Antec Aria (which I haven't 100% decided on)
I've got 1 GB Kingmax ram (2x512), a hitachi 160GB SATA and a Sapphire Theatrix...