Ok so I have been looking for a GPS head unit for a week now and think I have it down to 2 and need a little help.  The unit is going in a 2005 Mustang GT so not sure if the iData Maestro works since I can not select it on their website.  I can get the 8100 for $900 and the 8200 for $950.  Just wondering if the 8200 was worth the $50 since I don't see much difference in them.

The problem with Pioneer is that you will not see any firmware updates once a newer model is out. you'll pay extra $50 for the possibility of bug fixes and updates until March. Then - your support is kaput.

$50 (5%) difference is way worth it. 

I bought mine at $300ish. even at that price point I believe that an extra $50-$100 is worth it for the current model.

where did you buy a 8100 for 300?

bought an 8200 for 979, still working on the discount.  Waiting on the receipt.

You might consider an AVH-4200NEX instead. I have an AVIC-8200NEX in my Escape which is a great radio. But we don't use the 8200 built-in navigation. I use Apple Carplay (Apple Maps) and my daughter uses Android Auto (Google Maps). I think I will put an AVH-4200NEX in my Altima. The 4200 has a resistive touch screen (vs the capacitive in the 8200) and I tested two different 4200 units and both worked fine. Both support Apple and Android. With the 4200 you won't need the Pioneer GPS antenna. You might also consider the free SiriusXM tuner with 3 month free subscription You can see my write-up at Escape-City.