Hi
Go with the 455! You won't regret it. With a 60inch deck and 22hp Yanmar Diesel, it is one mean grass cutting machine.

I just bought mine this July and can see why everyone who owns one won't give them up. Beautiful ride, controls are easy to use. Cruise Control is nice if your cutting wide open areas. Not to mention that Yanmar sips fuel. If you plan to run this mower as a "long term mower" then the 455 is for you. Mine is 12 years old but with TLC it should last 20+ years depending on how many hrs you put on per season. Mind has 876hrs on her now, with plenty of life left. Typically you can get 3,000 - 3,800hrs on them without any major problems before a rebuild is in order. However I have seen one 455 with 6,335hrs( all orginal too!) and another with 5,200hrs. However again, if your going to be running it for years, your best bet is to find a 455 in the 300 - 800hr range. However I would not hesitate to buy one in the 1,000 - 1500hr range. In short, they are a Great tractor, well built and heavy duty. They may not be brand new but their well built compared to what you get at a Big Box store( IMHO). Either should be a great tractor but I much prefer the 455. Take Care JB