For those that have already taken the plunge, how much memory is recommended for airplane only uses such as Foreflight plus perhaps a handful of other aviation charting services.  Foreflight lists 18.7 Mb required.  It sounds like the smallest of IPad capacities would be sufficient for aviation only use.  Thinking thermally, I would guess that less memory would take less power to drive. 

I'm also thinking ahead to active cooling for the installation.

-still waffling but getting closer,

Chris Zavatson