Quinter - that is a small town, been there once. Know of a family or 2 there, so that's like 5% of population right there
I have not used the Scag walk behind, but I understand they are very rugged and do a great QOC. I'm sure you would have some Agr. dealers around but is there a Scag dealer local?... or over in Hays where you may check one out. For that matter they may allow you to demo one for a day.
There is a stander option if you are concerned about big yards through small gates. Probably a moot pt since your sons will be doing all the hard work anyways.