While the DK45S will handle an 84" mower, I would go with a 72" for lower cost, and better maneuverability. I'm convinced that the Woods mowers are well worth the money and I've seen many very old Woods mowers still hanging around after 30 years.
That said, I use an economy brand, Howse, and it has done very well for me. If cost is not so important, go with the Woods.
John