I think you touched on an important thing we all miss here at times. We all have different needs and different preferences. I prefer the less complicated engine, but it is not a major driver for me. I like the color of the new Summit tractor, but I am not about to buy one. The UM72 is on my list, too. I may hold off on the tiller for now, though as I have higher priorities.
I ran some numbers on the 4820H at Big Tex. The package deal comes with 6' tiller, box blade, and mower/cutter and a PHD. $35k and change. Based on pricing I could locate for their implements (or cheapest if I didn't know make/model) the tractor portion comes out to about $28.5k. I don't know how much they charge to add the two pair of ports in the back (or 3rd function).
I also went back to my master spreadsheet... The 347H is the same one I used for comparison on LS. The FEL ht is more than a foot lower. Also, the 3pt lift is 600 lbs (20%) less. you may never need to lift more than 2700 lbs, but I figure it puts less stress on the machine when you are well within the parameters. It is also nearly 2.5 inches more narrow than the 4820. May not be much on paper, but it could be crucial if you are on a slope.
I toss this all out not to sway your opinion, but for you to use in negotiations. Any of these would be good to have and considerably more affordable than the green/Orange options.