hello.. I'm looking to upgrade graphics... should I get 2 PowerColor TurboDuo AXR9 280 3GBD5-T2DHE/OC Radeon R9 280 3GB 384-Bit GDDR5 at $169 each or high end card?... mobo is z87x with cpu 4670k OC to 4.6ghz. current graphics is gtx560.. I run 2 displays but would want to run two displays plus hd tv (3) .. please advise .. best price point/performance for less then $350... for new graphics.. thank you!