Brian, First thing to consider is what vehicle are you putting that 300 gallon sprayer on. You have to remember that 300 gallons of water weighs aprox 2400 lbs. Add to that the dry weight and any additional weight you will carry I.E. fertilizer. If you have the rig a 300 should do you but you have to know how much you are gonna be spraying. My Walker sprayer is calibrated so I can get about 50,000 sq ft on a 35 gal tank of mix, spraying Speedzone. Each herbicide has a different rate as you learned and the application rate for you walking with a hose is different than me spraying out of a 4 nozzle 8' coarse mist sprayer at about 3 mph. I currently do not have a tank/hose combination but will pick one up for the small properties this spring. I would stay with the Honda if you can afford it. That price seems in the ballpark if you get a decent pump with the Honda. 400 feet of hose can get to be a bear if you don't have a helper. Heck we only have 200 feet on our fire engine jumpline for 2 guys and that is 1 3/4 dia. I know thats not a fair comparison but hopefully you will have access to areas not that far from the truck. The electric rewind is a must. Talk to the Reinders guy and have him write the calibratrion figures down for Speedzone. I don't know what tank mix he is saying will require 100 gal per acre, I'm not saying he is wrong. I just know that my sprayer is different and I cover more area with less mix. You have lots of work ahead of you. Can't wait til the temps raise a little. -10 is a bit too cold for me to get fired up about anything but eatin. Good Luck.