some good sites you brought up mike
somehow to me it makes more sense to get a mower to use for doing something that makes sense'like racing' than doing something silly like 'gak'cutting the grass.
you can always get goats,or con a neiborhood kid into doing it for less than the cost of a machine that will spend most of it time sitting and watching the grass to grow,and wishing it was on the track instead.
have to keep the mowers feeling in mind to.
have a nice day