If you want an exceptional tractor and even greater value, take a look at a 2003-2005 GX345 or 355 (diesel) with differential lock. These tractors were way overbuilt, and considered by a lot of JD fans, as one of the best lines of L&G tractors JD has ever put out.
The older X5xx series are also outstanding machines, and available with 4 wheel drive and diesel engines. These tractors are about 6" longer then the 345 and about 250 lbs heavier, with larger 26" rear tires. I think JD stopped producing this line about 2006. It was replaced with the X7xx series.
A nice GX345 will run about $3000-3500 with low hours. The X5xx series will be about $1000-1500 more, depending on the hours and condition. Either one, you will not be disappointed.
I am not a big fan of the new X5xx. I looked at them myself, and just don't think the quality is there. Just my opinion. The X7xx is a whole other story, a lot bigger and A LOT more money.