Can anybody guess how many coins you'll need too get a R9 280X? I understand it's up to the markets. I'm just curious what so people may say.
I've concluded you'll pay more per GPU with GPUCoin than with Fiat. You can bulk order from various websites and get R9 280x's for SUB $400 USD. Remember, these guys failed at obtaining R9 290's after hyping it up and claiming "we have access and can sell ASUS R9 290 cards at $575.00 USD shipped to continental".
Personally I have no interest in R9 280x cards, especially not the Gigabyte version (they have heat problems).