Gatorboy,
If I recall you have both a tractor and a skid steer. I'm assuming you have both because they both do some things better than the other. I would apply that same logic here and get both the generator and the cordless saw w/multiple batteries. You can get the saw first and if that is all you end up needing then great. If you find you need more power then go get the generator. You will find uses for both of them in the future.

My first cordless saw was a 9.6 volt Makita with around a 4" saw blade. I now have a 18 volt Makita with a 7" blade. Believe it or not the 9.6 volt still gets used every now and then. That thin and tiny blade works great for cutting FRP in commercial kitchens. I also have two generators, a 7500 watt Dayton from Graingers and a 3000 watt Honda. The little Honda is my favorite as it is one of their quietest models. It has the idle feature which throttles down the engine when it is not under load.

Here is the link to the Honda generator that I have.