I still use a 32GB iPad 2 with Foreflight, Goodreader, MyGoFlight Sport kneeboard and a Bad Elf GPS Pro for an EFB. Good size in the jets, but a bit large in the 185. Beats the heck out of a 35# flight bag. There are power plugs in all the aircraft I fly, so iPad battery life isn't an issue. Next check, have MX install a cig lighter power receptacle and get a plug that will charge the iPad. Not all of them will.
I would consider a Mini, but I don't want to carry two, as I like the "Maxi" pad when outside the cockpit. Life is a compromise.