okay guys so i need a gpu for around 200-300 pounds which leaves huge options open that many i need opinions of others to decide what to get. the options are a gtx 770 2gb or 4gb , a r9 280x ( these are now horrible priced or out of stock ) , or any gtx 760 or possbly save up for a higher tier card 780/r9 290. i game on a single 1080p monitors but it is a 144ghz so if the card is over kill in fps it doesnt matter , however i may be upgrading monitor around june ish. to higher res but lower ghz. any suggestions are welcome. also sli or crossfire is an option i can take for future proofing thanks.