[tdwg-tapir] Content Delivery Networks (CDN) options

(Offtopic, but hoping some other institution has some exerience on this) Does anyone have any CDN experience they'd like to share? Currently we need to move about 80-100GB of PDFs to a provider, because we're serving up ~8.5GB/day, and it's killing our internal bandwidth. We've considered things as basic as GoDaddy, but at 6.99$/month that has to just be file hosting, not a CDN right? A package for that amount of data at Cachefly looks like it'd be around 99$/month. Other things like Amazon's S3 are being priced out, but what about Akami, Level3, etc. Any advice, guidance appreciated, we see this as a short term fix, with a new strategy to come for next year.

Thanks

P