Similar to the Zotac MAG this comes highly recommended. This time around the ZBox HD is a complete barebones system, it has no RAM, No Hard Drive, and No OS. Why would you want this machine you might ask? Well you can completely customize it to how you want. It is relatively cheap and has some nice high end features including support for DDR3 1066 RAm (most are DDR2). It also comes with a VESA mount with is very nice. So if you want to go the home brew construction route this might be for you. Here are the specs:

Processor Atom 330 (Dual Core)
Memory None – Supports up to 4GB of DDR3 1066 RAM
Hard Drive None – 1 empty 2.5″ drive
Video Ports 1 VGA, 1 HDMI
Other Ports 6 USB, 1 eSata, 2 jack Audio Port, 1 Optical Output, 6 in 1 ((MMC/SD/SDHC/MS/MS Pro/xD))
Operating System None
Wifi 802.11b/g/n
Optical Drive None
Included Accessories Vesa Mount, DVI-to-VGA adapter

This machine costs $230 and is available at the following:
Newegg:

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