The Tab A is no slouch of a tablet, but is definately a lower end model from Samsung. It's biggest drawback is TFT display and lower resolution. This will have an impact on bright sunny days and on old feeble eyes.
If you can afford it go with a S2. You dont need the 10" (imho). If the S2 is out of budget, look for a S. Tab S 8.4 is perfect, has a good screen, good battery, runs fast, and fits nicely almost anywhere in the cockpit, although It did block the panel when I put it on the yoke in my 210. Mine mounts to the front windscreen on the far left.
In any case, get a micro sd card to put the data on, this way you dont need to buy the more expensive higher memory models. 16G suits just fine with a 128g external sd card.