Others may have a different opinion, but here is mine. Going from 50" to 60", is that a wise choice right now with the economy? Do you have the business to support new mowers? Also, as I don't know much about Toro, but do your research, will a 60" save that much time over a 50", and what is the total weight between the two. Remember, 60" adds a little more weight, but is it there really that much difference in weight? I run nothing but diesel mowers and if I can help it, I will stay that way. Look at the lawns you mow, are they big areas, small areas, etc. If you have a mix of both, could you get by with just replacing one mower with a bigger one? Then it goes back to what I said earlier, will you save that much time? Look at the added fuel expense too. Hope this will help and will give you a little more to think about!