I've scoured all over trying to find a comparison or recommendations and couldn't come up with what I was looking for. I'm in the market for a ZTR. I only mow just over an acre, but plan on purchasing a new house and hopefully more land within the next 4 years. The ferris dealer is right down the street, which is very convenient. They have a left over 500 with the 44" deck and briggs motor. They are asking $4400 for it. They also have a 600 with the 48" ICD deck and a briggs motor. They are asking $5200 for it. Is the 600 worth the extra $800? Is ICD vs non ICD a huge difference?