Welcome to JKO Dennis.
I added MyGig to my '09 several years back, in 2009 since my Jeep came with the 6disk in-dash CD player. I bought the radio off ebay ($600 If I recall correctly,) from an '09 Ram Truck and it was a plug-and-play operation with no additional harnesses to add. For the U-Connect and microphone addition I bought two kits from MOPAR and spliced them together to run the mic into the OEM interior piece that I bought from a '10 that goes up in the driver's side A-Pillar.
BEing you have a 2010, you should have an extra harness behind the radio that runs from behind the radio and over to the A-Pillar to connect your microphone (regardless if you have u-connect now or not.)
Now with all that said. I would advise you do not go with a MyGig radio. The technology is old, outdate, and wasn't really that great to begin with. Plus since they're a few years old, unless you're spending the $1800 on a new unit, which would be foolish, any used one is not going to have much life left in it. I am topless and doorless most of the time and the AZ heat and sunshine killed my MyGig radio in about 18months. It got to where the screen wouldn't register touch and would select things on it's own.
Instead of replacing it with another MyGig, I decided my phone was good enough as a gps device and I went with a single din multimedia deck from Kenwood and put the single din-sized Cobra CB radio underneath it. I don't miss the MyGig one-bit. The aftermarket radios today are easy to instal, more advanced and more affordable then they've ever been.
Let us know if you have any questions. Hope this helps.