Danny, my advice is to go with the 40D. You get the 4 cyl engine, added HP and the mid-pto capability. Also, don't expect to get the dealer to drop his price a whole lot less than the $1,500 difference from the 35 to 40. I still think his invoiced differencial is something like $1,200. I bought my 40D on what was left of the old Ford A plan and so I got to see the dealer pricing. I still think the $1,200 to $1,500 addition would be worth it, but not the added cost to go all the way to the 45D. I believe the 45D has the same engine block with just a longer stroke. The 40 and 45 have the same hydraulic pump, same 3-pt lift capacity, same hydro pump with same relief valve setting. Obviously, you get see the added 5 hp at the PTO, but for pushing and pulling, the hydro system relief valve is set at the same pressure, so my guess is you'll hit the relief on the pump in all but the lowest range, before you truly see the added 5hp. Just my experience. Good luck with your choice.