I'm no authority on which is best, but JM Bullion gives you a 3% discount when using BTC. Shipping is free with orders over 100. Also, they are friendly and fast and you get quick notification when your metals get shipped. And....the calculator is easy....just remember to add in the small # for the transaction fee from the exchange. I screwed up the first time and lost $3 because I had to make 2 transactions. Ooops. No biggee.