We really considered the GT, but got a Touring with the Moon-roof/Tech package. Part of the decision was due to the wheel/tire combo, the salesman originally said it was about $40 a wheel difference in the tire prices....more like $120 a wheel from what I found. As a personal preference, the leather in the GT did not appeal to us, it seemed more stiff in the cushioning, and the grade of leather on the one we test drove was pretty slick. As we live in the south, the cloth is also significantly cooler....so it was our choice.
The only thing that I am missing on our model is the Advanced key-less entry, but not a big deal, just would have been a +1 on all trim levels as they all have push button start.......
The Eight way power seat is supposedly an upgrade, but the other two axis for it seem to be the in/out function on the power lumbar, how often do you adjust that? As for the heated seats, we live in the south, so not an issue for us.
The heated mirrors may just be a wiring connector on the mirrors, currently I am researching this and will post on what I can find.
http://www.mazdas247.com/forum/showthread.php?123819567-heated-mirrors-on-touring
The dual zone climate control is a bit crowded, I actually like the cleaner interior look on the Touring, so it is a personal preference.
The only other item that the GT with Tech has over the Touring with Tech has is the Sirius XM radio...... plenty of aftermarket/dealer options there.
The CX-5 has no engine options and only minimal transmission options, as for AWD..... Not my thing, but does not seem too bad on this model for penalties/bonuses such as MPG and handling.
Whatever trim level you choose, I think you will be happy.....