I don't want to speculate in what your business is doing, but to me, this sounds as folly. I can't see how any provider would want to sell 10 Gbps uplinks without a) having metering in place (95th percentile) or b) pricing the uplink as using 10/10 Gbps at all times (costing, what, 15.000+ USD/month?).
If you're getting this at significantly less than 1- 1.50 USD per Mbps, then I would worry about a potential future SimpleCDN situation -- i.e. your upstream provider decides that you're not a profitable customer, and cuts the line.
If you want lots of cheap bandwidth, the Hurricane Electric's DCs in California are often suggested. You should look at Web Hosting Talk's offers board, as well as ask for user testimonials in their forums.
EDIT: OK, I see that FDCs "unmetered" package costs 17,000 USD/month. If you're ready to pay that kind of price, then I don't see what "unmetered" wins you. You could probably get the same pricing from HE, Cogent, and others; and it would be "metered" but even if you use 100% of your 10 Gbps, it would not be more expensive?...