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To be honest having it shipped overnight vs 2 day really probably wont have much effect if you get fiji rock as its really been out of water for a period much longer than just the ship time to you.
I have had fiji dieoff take weeks to cure and get to a point where there is no ammonia production.
I have ordered two separate times from liveaquaria.com and have had good results. My second batch of LR that I ordered had considerable die off, but it has already shown signs of "perking" back up.
For the price, I think they are probably one of the best LR vendors on the net. Although I am hearing a lot of good things about liverocks.com so you may want to check into that.