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Based on my research, the R9 290 would be faster than your SLI 560 448's. Plus you would have ton more VRAM, and you would drop your power consumption (and noise) considerably. You can sell the GTX 560 448's for $75 each, so it would only cost you $60 for the upgrade. I would do it.
Did some of my own digging around and you're pretty spot on. My SLI's are both cooled with closed loop coolers (antec 620's I think) so noise isn't particularly an issue but I'll be glad to get rid of the extra heat dump in the room and it will certainly help when I game on the 1600p monitor.
Edit: Don't suppose there's any easy way to get two of these cards and fulfill the rebate on both? Would it have to be a different name + address + card or could I get away with just a different address?