Honestly save your money and upgrade to a new DX11 card that can play games on higher resolutions, because you never know when you'll buy a new monitor.
I had an HD4870 512mb because at the time I had a similar resolution on my old monitor as you, however after a month or two I bought an ACER 23in. 1080p monitor and I've regretted buying the HD4870 specifically the 512mb version.
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