What type of lawn is this going to be used for? I have seen a rear discharge deck (Hustler) in action over the past 3 years and it does indeed make the cutting easier because the discharge area is 2 to 3 times as big as a side discharge. BUT... and this is the most clarifying aspect of the rear discharge deck, it does NOT cut up the clippings well enough at all. I used to want one shortly after I saw it and I talked to a Hustler dealer. I started noticing what the dealer was talking about with the clippings. For a residential lawn or a business where image is important, it would do no good, you'd have clippings laying all over the place.
What kind of cutting are you getting this for? Large fields only?