I opted to just go ahead and return the device I have now, via Amazon, and ordered a replacement.
I was going to go with a USB 3 device, like you suggested, but all of the vendors I looked at say that the DL-3500 chipset isn't mac compatible. I read reviews that said it works just fine but, at this point, I really don't want to take the chance.
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Early 2011 Macbook Pro / 2x Dell 2209 WA (1 via thunderbolt 1 via DisplayLInk) / OS 10.9 / DisplayLink v 2.1 Driver
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