Thanks for the help alxandy. I use this motherboard http://www.gigabyte.com/products/product-page.aspx?pid=4385#ov but i only got a 550watt power supply (corsair) and i only got £250 - 300 at a push to work with. Thanks for any help and advice
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970 or 290X
Me personally I would go for the 290X even if it was a choice between the 980 and 290X.
Sadly I don't think your board could handle a FX 6300, especially overclocked. There is no VRM cooling whatsoever so it would just be a throttling nightmare.
https://www.overclockers.co.uk/showproduct.php?prodid=BG-704-AS
Would be a good board for the 6300.

The prices are insane on the 290/x's right now, it's unlikely there will be such value propositions available a month from now.
, who would they expect to be buying these cards?
It says it needs 600W to power it, does that mean if I dig deep and get a second one, I would need 1200W PSU to SLI these cards?