I made this list to easy your selection of these tablets.
10", 1366x768, 1.2 lb (w/o 1.2 lb keyboard), HDMI, USB 3.0 (on keyboard),
HP Omni 10:
10", 1920x1200, 1.43 lb, Z3770, HDMI
GPS, 1 lb, 19,500 mWh, cannot be charged while using USB devices, HDMI,
Dell Venue 8 Pro:
0.9 lb, 18,500 mWh, cannot be charged while using USB devices, dual-band Wi-Fi, too sensitive touch on some units,
Lenovo MIIX 2:
GPS, 0.8 lb, 17,500 mWh, can be charged while using USB devices, too bright at lowest brightness & poor blackness,
All (unless specified above):
Intel Z3740 CPU, QuickSync (better than Z2760's compression quality), 2GB RAM, 32-64 GB eMMC, 8", 1280x800, 8-10 hours, Miracast, Windows 8.1, Office 2013 Home & Students, charge via USB (2.0),
The bottom line: seriously lack of HDMI and/or USB charging while being used. Don't buy now, unless it is below $199 or 10" is not too large to you.
If you use traditional Windows applications and/or use remote desktop client, avoid 1920x1200 or higher on 8" and 10" Windows, because text will be either too small, too blurry or too messy.
This article will be updated while newer information available.