byron1, welcome to the thread and thanks for posting. The more information we share the, stronger we all become...
Who was the distributor? Does the $375 cover everything? Based on my very limited research, bonding would cost $300 with a variable $100 to $150 "prototype" tooling fee which covered bond material matching, and such. Do they offer this with 8.4", or did you just get really lucky with your target dimensions??
For UV protection you want soda lime glass. See my touchscreen thread in the Input Devices sub-forum. Don't know if the capactives use this type of glass. See Wikipedia for details.
I think the optimal solution is 3-6 mm soda lime glass optically bonded with multi-layer AR coatings (five is best). You then attach an IR touchscreen on top. Serious coin!