If your wife thinks 5 acres is too small for a tractor, tell her I only sit on ONE acre and I just bought a Kioti CK20S HST TLB.
A tractor just makes life easier, so it doesn't matter what size lot one has.
BTW, I only have a few trees on my lot, so I really don't have use for a grapple, but that might be my next purchase. Either that or a PHD, which I will need to install a fence. I'd rather have the grapple.