I have a DX45, my brothers have a D35 and D40. There is 720 hours on the DX45, and over 300 on the D40. The DX45 just needed a battery (4 years old, and a roll pin came out of the shift linkage on the D40, but otherwise they have been trouble free. If you want a Hydro (DX model), you get the deluxe package including the tilt telescoping steering wheel and the suspension seat with swivel. My brother upgraded his D40 with a right hand step, a chain box, remote control radio. If you are getting a loader, consider getting the quick coupler bucket. You can use skid steer compatable pallet forks or anything else from skid steers the tractor will handle. The DX35 has the same wheelbase as the larger models, but uses a 3 cylinder engine and a lower pressure hydraulic system so both the loader and hitch lift 200 lbs less than the 40 or 45. If you are loading heavy gravel with the 72" quick coupler bucket you are at max capacity with the 40/45.
Hope this helps.