I've got a B7800 with the 72" mid mount mower so pretty close. I'm happy with it. My deck is drive over, which makes mounting/removal easy. It's got swivel solid rubber casters on all 4 corners and antiscalp rollers in the center front and rear. It does a great job, not the excellent cut the 72" Exmark ZTR I had previously, but I don't own a golf course either. That big wide deck covers some ground, but if it's not all flat you may have to make a few passes to get things mowed evenly and follow ground contours through a drainage swale without scalping. On this size tractor I wouldn't want a deck any smaller as the width clears the tires better making trimming nearer to things easier because of the deck stick out.
If your dealer is decent he should let you test drive and get a feel for it.