I bought a Cub GT2000 in June 2011 with the 42 inch deck and bagger. Now have 120 hours (3 seasons) on the machine. Cost me around $4,000.00 at that time. I understand that the prices have increased a bit since then. I do use my GT2000 for pulling a trailer around the yard with tree debris and moving dirt. I did a lot of investigating before I bought the GT2000 versus the Big Box Store 1000 series because I knew I would be doing some things such as pulling some heavy loads around the yard. The 1000 series just will not take that kind of load on the tranny. I am glad I went with the GT2000, Kohler Command engine (top of the line) versus the Kohler Courage Line on the 1000 series. I don't know that the shaft drive on the GT2000 versus belt drive tranny on the GT1000 series makes any big difference, but the frame is much heavier than the 1000 series. Cost was a big factor for me, I wanted a stout machine at the best price available. I have been well pleased with the GT2000. If you do purchase the GT2000 series with the Kohler Command engine, I suggest you use the Kohler Brand Oil 10W30 (needed for the hydraulic lifters) (don't have to adjust them). It is packaged by Warren Oil out of Dunn, NC (I think) and does have an extra dash of anti foaming agent in it. Cheapest place to buy is (RepairClinic.com) as well as the Cub filters and Cub transmission fluid. You can sign up for their emails and they email approximately monthly a 10% discount on your purchase. It is delivered to my door cheaper than I can pick it up from a store. I do use Cub Branded tranny (hydraulic) filter, some have reported problems with other filters. I also use Cub branded transmission oil (expensive) some use Shell Rotella 15w40 (much cheaper)as their transmission fluid and some get by with it and some have problems. My Cub is run during the summer with 95 to 100 degree ambient temps. and that is tough on the oil (any oil) Kohler recommends 100 hours on the oil change. I would not go there. The oil (additive pack) is beat after 37 hours in that heat and starts to burn a little oil. I change it then and don't worry about spending 20 bucks on an oil and filter change for a $4,000 machine (that should last me 15 years or so). Once the oil is changed, no more oil burning for another 37 hours. Keep the air filters changed and pre cleaner clean. Some people swear by synthetic oil and how long they can run before changes. For me, I prefer to use regular Dino oil and change it to keep the dirt out of the engine. The transmission in the GT2000 is (Fully Serviceable) fluid and filter, a little over 5 quarts on the change, (the life of a hydrostatic transmission) a 20 minute job. The 1000 series is not serviceable and maybe has 2 quarts or so of fluid. If you are looking at the "Green Paint" and want to pull any weight behind the machine, stay away from the lower number 300 series as they have the troublesome K-46 transmission in them. If you pull any weight behind it, you will fry the tranny. If I were going "Green" it would be the X500 or better. Green paint is very expensive. IMO, the Cub Cadet GT2000 is the best bang for the buck, by todays standards, which unfortunately "ain't what it used to be". I have been pleased so far with my GT2000. Best of luck with your decision.
Leo Rabon