My main concern obviously is the HST, or rather lack of it. I keep thinking that it won't be long before one of the big tractor companies come out with a utility sized tractor with HST, but of course that may very well not happen and like you guys said, my biggest regret will be waiting too long to upgrade. If the M7040 has an HST tranny I would probably have one in my yard already!
I don't know why I'm so indecisive about giving up the HST tranny, I guess because I like operating the tractor so much with it.
I went to the local Kubota dealer to check out and drive a cab 7040 (after calling to confirm they had one on the lot) an when I got there the salesman went out to "find" the tractor and realized its at they're other location. I really need to drive one because I can't fairly decide which way I wanna go without giving it a test drive. I was aggravate when I showed up and the only M series they had was a basic 6040 2 wd with standard shuttle.
I would certainly want the hydro shuttle an I'm slowly realizing (thank to you guys) that in order to see an appreciable difference in power and performance I'm going to need to step up to the plate and give up my beloved HST
Of course, once I definitely make the decision to go up a frame size I'll have to start checking out the Deere, kioti, NH, and other equivalents.
One thing I didn't realize was that the M series is a lot more stable and better riding than the L, I'm glad you guys pointed that our because I DO have a LOT of hills on my property.