At risk of throwing a spanner in the works, £250 would likely get you a 290.
http://forums.overclockers.co.uk/showthread.php?t=18578802&highlight=290
http://forums.overclockers.co.uk/showthread.php?t=18578218&highlight=290
Not sure if they're all sold out or not though.
Reference cooler, i would prefer the 780 if its a reference cooler in all honesty. Don't worry Matt, a 780 wouldn't turn me for Green only

Suarez7, are you getting a Titan / 780TI any time soon?