As a feral with not much heroic gear I'm going to buy the necklace first, since I don't see my raid group killing HC Ragnaros anytime soon.
Then I'm going for the Relic, I haven't seen a crystallized firestone for ages and I probably won't go back farming FL HC just for that :P
I'm also going to get the Valor points Boots and Wrist since they are BoE and have 2 alts who can farm them.
I'm incredibly disappointed that nothing we can buy with VP is BiS, not a single item! :3