The panhandle of Florida is probably going to be my prime destination when I get my PPL. When I look at the airspace on my Garmin 696, I think to myself, how am I ever going to get there. Thanks for the advice.
Here is a potential issue for you. I have been looking at similar airplanes. Do both of your aircraft have WAAS? I am willing to guess the GFC700 one has it and the KAP140 doesn't. I think it costs $20k-$30k or so for the WAAS upgrade.
If you are looking for a hardware upgrade that will make your computer seem like it is a brand new cutting edge modern day computer, I can not recommend installing an SSD hard disk enough. It takes my computer under 30 seconds to get to the start menu from a cold boot.