Looking to buy a premium 27" 1440p monitor for both high-end gaming and Photo editing. 144hz minimum with freesync/g-sync, good colours, black levels and HDR (600 nits or above). If its not possible to get all these features in one monitor then I'm prepared to drop the HDR providing the SDR is exceptional quality. I have around £500 or so budget. Any recommendations? I'm in the UK.