Since the EDIT option expired I'll have to post a new reply, so here's what I like/dislike about the Aopen Xcube AV Edition.
Pros:
SFF(Small Form Factor) Design makes it ideal for a home media center placement, like any other Hi-Fi equipment.
Aluminum chassis for added weight savings and better cooling, this includes the power supply also being made of an aluminum cage.
4-in-1 card reader in place of floppy disk drive.
Front panel connectors including Audio, USB and Firewire.
Prescott CPU ready motherboard with dual channel memory slots.
Support for both SATA and PATA HD's.
Comes with a separate TV/FM Radio tuner PCI card.
Remote Control that basically covers all the functionality you could want.
Home Theater Software app by a third party software developer, in this case Intervideo. It requires Windows 2000 Pro/XP Home or Pro to run properly.
Comes with an all Copper CPU heatsink fan along with the Smart Fan control on the motherboard BIOS for quiter operation.
Cool black design makes it look like other Hi-Fi equipment in your rack or media center.
One PCI and One AGP slot available on the motherboard, however since the TV/FM Radio tuner card takes the PCI slot you only have an option to add a decent graphics card to the AGP slot.
Cons:
No room for an internal floppy drive, USB only and external, sorry about this you legacy folks out there.
The Smart CPU Fan control seems to be too conservative in it's settings, with a Prescott core CPU the cube can become something akin to a space heater

Only room for a single HD, so make it a very large capacity drive as you can only add external USB/Firewire drives

Only room for a single Optical drive, so make it a DVD-RW to get the most out of this box.