I love the Mark IV for his versatility, I test the UWUI in it, and run cool, only a bit slow in the refresh time. His 28 hours of autonomy with 2 batteries (13A,3,7v) its make for me the perfect device for PenTesting.
I want also test it in the G1TV Android MIni PC (http://hakshop.myshopify.com/products/g1tv-android-mini-pc)
1GHz Cortex A8 Allwinner A10 CPU
512 MB RAM
4GB Storage
Wireless 802.11 b/g/n (Ralink 8188 Chipset)
Android 4.0.3 (Ice Cream Sandwich) including Play Store
Micro SD memory expansion slot
USB OTG and USB Host Ports
HDMI Output at 1080p
5v 2a Power Supply
60 x 60 x 13 mm
Compatible with MK802 Linux Images
The specs are very near that you looking for, and can be a very cool device for this kind of applications.