Yeah...no offense but you're kinda all over the place here. Anyway, changing the deck on the JD certainly can be done but I'd say it's not going to be practical cost wise. The other thing is productivity. A 60-61" deck should cut approximately .5 acre more per hour than a 52". This is of course a "ballpark" estimate but close. I've got a property 2.5 acres or so that takes us 2 hours to mow, but it's full of trees, obstacles, hills etc. We also have properties that are flat and open that we can cut 6 acres in that same 2 hours. Point is most mowers can go real fast but few of us can cut that fast in most ground conditions...it's just unrealistic. I crack up reading top mower speed specs...all that does is tell you how fast you can speed back to the trailer on pavement/roadways. So, say your 52" Deere can cut your 9 acres at 2.5 acres/hour...you're at 3.6 hrs of cut time. Bump your mower deck to a 61" and you gain about .5 acre an hour...you save .6 hours of seat time each time you cut. You need to determine what these numbers mean to you...if you're doing this as a business, cutting 5-6 days a week, I'd say there's a real consideration there. A smaller deck is usually better on uneven terrain as well. The other thing is, a Turf Tiger really isn't going to mow any faster than any other 60-61" machine in a normal scenario. It's a big powerful beast but in any "normal" scenario, especially a homeowner situation, it's way overkill IMO. There's lotsa hobbies/toys for you to spend that cash on...