My 30 year old Lawnboy died today. The motor runs fine, deck and wheels are in good shape, it's been well taken care of, but the transmission gave up. I am looking for recommendations for a new mower. Self propelled, mulcher, bagger, capable. I would like 21". I mow the yard with my tractor, my wife trims with the Lawnboy. Any advice on what is good, or what is bad? Thanks for any help.