I have a Metro 36" that was purchased in 1996. It has 501 hours on it. I mow about 1 1/2 acres and would like to shorten my mowing time by moving up to a 48". I've enjoyed the quality and durability of the mower and am trying to get a ball-park estimate on what I might expect to pay for a new mower and trade-in my 'ol buddy. Again, just looking for a ball-park........thanks.