I didn't realize how expensive mithril full plate is. 10,500 gp which is over the 6,500 max gp limit per item.
I could do a mithril breastplate for 4,200 gp and be within the 1/2 cost and move at 40' from speed of thought and not spend a feat on heavy armor, but I'd lose 3 AC and be less of a tank.
I think I'll do that and bump up my dex a little bit from what I was originally considering.