OP specifically mentioned issues with exposures not looking on the screen like lightroom when he gets home.
To address this, be aware that many tablets have a limited color gamut, and will ALWAYS look different from a nicely calibrated color monitor with a wider color gamut. There is nothing that can be done except to be sure you pick a tablet with as wide a color gamut as possible. Neither Lightroom or any other software can fix a limited color gamut.
The DisplayMate web site evaluates a lot of mobile displays for vatious charcheristics that are of interest to Photographers.
You can see the extensive results here for some of the full sized tablets. If I were going to pick a tablet which would have a display and colors that were as close to a real monitor as possible, it would be a Kindle HDX, followed closely by the Ipad air. The Surface RT is good but the Samsung is a step down.
nice link thanks for the info
here is what they say about the new nexus 7
"Overview of the new Google Nexus 7
The new Google Nexus 7 (manufactured for Google by Asus) has a very impressive display that uses the highest performance LCDs with Low Temperature Poly Silicon LTPS, the same technology used in the iPhone 4 and 5, but on the new Nexus 7 with more than 3 times the screen area – it’s currently the second largest LTPS on a mobile display after the Kindle Fire HDX 8.9 mentioned above. The very high efficiency LTPS technology allows the new Nexus 7 display to provide a full 100 percent Color Gamut and at the same time produce the brightest Tablet display that we have measured so far in this Shoot-Out series. More on these issues below."
100% color gamut
i know i felt it was really nice to use and view picture on but wasn't expecting that