In other words, I think you're misjudging both boxes' capabilities based on issues you're having.
All of the Live HD, Live +, Live Hub, and Live SMP would allow network access to attached storage (read and write) AND do Autoplay.
My display says so. Along with streaming HD audio (DTS-HD MA) via Plex. Plugged in an external drive into one of my (very low-end PCs) and Plex served up the HD file wonderfully. It appears no one is using this thing... is there a good reason not to use it for streaming HD files? I wish it had Amazon Instant Video but for $65 it beats putting most anything else in a room for pure local (HD MKV) streaming.