What do amd graphics cards

Hi all so I need a new card and I'm thinking amd anyway I've been looking on eBay because I don't have the money to buy new anyway my options are roughly:

a 7950 for like 190

a 7970 for 285 which I would flash to the ghz edition

or a r9 280x for 400 new

you may be wondering why the prices are high well it's Australia anyway I just want think now what the community thinks the best price for performance would be also I was thinking whatever I get eventually in the future  I will crossfire so yeah what are your opinions?

I'm in New Zealand, the Prices are much worse. I'd recommend the 7970.

I'm in New Zealand, the Prices are much worse. I'd recommend the 7970.

Yeah I know that's unfortunate man just in comparison to the us and such.