Wait till you upgrade your monitor, see how the performance it and then decide.. A single 570 should be fine for up to 1920 x 1200..
If you do decide to spend then look at something like the MSI 670 PE, $100 cheaper than a 680, cooler and the same performance.
My preference would be single card unless your going to High res (27" IPS or 3 x 1080 etc etc) on the monitor. Close performance, no SLI worries, cooler, less power, quieter.
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