Supplier 1... They understand the value of their service and know that they are going up against people quoting 40% cheaper. There's a reason they quote $2000.
Supplier 2 has to be cutting something out, whether the end product is going to reflect that is anyones guess. Is it worth taking the risk (even when its not your own 88e money)? Probably not.
Edit: We've actually had quoted customers come back to us and say that we need to quote higher, since they wanted to go with us but the company policy was to never go with the cheapest quote for a service. Resubmit the quote 30% higher and we'll get the deal.