There is an old adage with regards to local bicycle shops, but it applies to almost anything. "Before you shop for a widget, shop for a widget shop." The brands you are considering are reputable; Stihl and Husqvarna are the Ford and Chevy of chainsaws, how you evaluate the dealer may decide the brand. This forum frowns on religious discussions.
With a 5+ acre woodlot of aging trees (typically 3 blowdowns a year) my go-to saw is 50 cc with a 16" bar--light enough to limb, large enough to buck and fell. 18-24" diameter trees can be handled with that length bar. The original post indicated you would hire out the big stuff.
I do not saw all day, every day, but during the 2 - 4 hours of actual sawing involved in cleaning up a tree, I probably drive my saws harder than a professional owing to my lack of experience and finesse. I have rationalized "commercial" or "pro" grade saws. You (or your husband) may be happy with a "farm and ranch" grade machine. I was not. I think you are correct to reject "homeowner" machines.
One other point--with sporadic or infrequent use you may find it helpful to spend $20.00 per gallon for pre-mixed, non-ethanol fuel.