Let us be realistic. For 3/4 acre you do not need a big high hp machine with a six foot deck. A smooth 3/4 acre yard with few trees/flower beds/obstacles will take you 3/4 to an hour with any homeowner type zero turn mower. If that is all you are mowing each week I would get a cheaper homeowner model and pocket the extra $1000-$2000 to buy some other toy. If your wife ever gets out on it you won't get to mow much anyway. Somehow or the other it seems that women try to take over the mowing when a ZTR is involved.
If you have money to burn and want a super high end machine go ahead and burn those greenbacks. I have a neighbor with about a half acre that inherited a bunch of money and he has the biggest gas powered Bad Boy with a six foot deck. He barely gets up to speed and has to turn. Three years and it is barely broke in.
I would also stay away from the box stores. Brands like Bad Boy and Cub Cadet that are sold at TSC for example are priced the same at the local dealer WHO HAS A REPAIR SHOP AND MECHANICS. Same thing with Home Depot and Lowes. They sell but do not service.
I do like my Bad Boy and I have a Kawasaki engine and a 54" deck and live on a one acre lot. I also mowed three other yards this week that ranged from 1/4 acre to 4 acres.
Once again, unless you have money to burn get a cheaper mower and spend the extra money on something else. Take care of the mower, change oil and filters, keep sharp blades on it, and keep it clean, and it will last you ten years or more.
RSKY, aka the Cheapskate