Hi Carter,
So, I have an 850 DT kit. Now, any kit you buy will have its challenges/quirks to deal with. I felt the 850 had a lot. That said, they have updated their kits since I built mine.
I went with the ABS because, like you, I had worked with ABS and I also have some limitations on the space that I can paint and trim fiberglass. After really getting into the details and what makes a DT kit look good, I have to say the ABS vacuum-forming just doesn't quite do it for me. Those painted fiberglass kits just look, for a lack of a better word, sharper.
At the end of the day, if you can manage to deal with the fiberglass (after looking at a garrison mate's ROTK, it doesn't seem that bad) then I would suggest to go the fiberglass route. If not, the ABS will do the trick to get you out there trooping.
Either way, at 6'2" you are gonna make an awesome DT!