...but I want to be able to have the ability to use microSD cards to keep my media on and be able to easily change it in and out...
If you put your music on Google Music, you can tap-hold on an album or artist and select "Keep on device", and it'll cache it on the device for offline listening. When you're tired of it, uncheck the same option and it'll be garbage-collected.
Honestly, dicking around with sync programs and SD cards would be much harder work.
They need something like that for movies. I suspect it'll come eventually.