If your serious about HST then you really should try a Grand L with the HST+ transmission. I haven't said much about it because I felt like you wouldn't value the extras the GL would offer. But things that make a big difference (to me) is the two speed HST motor. They have the standard gear box like all HST tractors have, 3 speed. The HST+ gives you a high/ low range for each gear. You can shift at any point in time, no need to stop or even let off the HST pedal.
For example, if doing loader work you can leave the tractor in M and when you get to the pile of dirt you want to move as you're are pushing into the pile you simply push the H-DS lever (like flashing your headlights in a car) and the tractor drops down into low gear giving you extra power. What this means is you don't have to stop, shift into L, push into the pile to get a load, stop, shift back into M, and then drive to where you want to go. Another useful place is on hills while brush hogging. If you get to a steep place you can simply flick the H-DS lever and go into L. That way you get more power for the attachment and more sensitivity with the HST pedal. On top of that you'll get the auto throttle (revs the motor up when you step on the HST pedal) and stall guard, if you are about to stall the tractor it'll drop down to low.