FWIW, if your old mower is in good shape I see no good reason to abandon it for a new one. I still use my circa 1997 Craftsman lawn tracter to mow 1/2 acre. I've had to replace or repair a few parts over the years, but nothing expensive. A couple of years ago I began to notice a small area on the deck that was beginning to rust through. I thought about preparing for a replacement, but ended up buying a whole new deck from Sears for about $130 (surprisingly cheap and shipping was only $7 flat rate). This is by far the most expensive repair I have done. I too live in Indiana and know that rusting is almost inevitable - there is no way to avoid mowing when the grass is wet in the early parts of the mowing season.