So since some here think I just disappeared I figured I would give an update on my decision and situation.
I decided against a backhoe for the DK40, the used ones are too hard to find with the subframe and I am not into making my open subframe and new subframes for the DK40 are hard to find (called several dealers trying to find one). That lead me to renting a mini (Kubota U35 Mini Excavator) from a local rental (20 mins away) for $200/day. Once I used this for 2 days to dig a sewer line and bury my gutter lines out from the shop and clear a drainage on the land, I knew a mini was the right way to go. So now it's the question to buy or rent. I have just over 100 acres we are building on right now and I can see getting a lot of use out one, but with the rental so close I am not sure buying a used one for $16K-$20K is worth it. I will be retired in the next 8 months and moving down to TN to the house next year, so scheduling to get it won't be an issue and they have several mini's they rent out.
I agree for some it makes sense to buy, even if just because its what they want to do. Some people buy a lot of cars, some equipment, some spend that much just on one vacation, me I love to hunt and ride my Harley, so hunting trips and making mods to the bike is where I spend my disposable income. I don't think there is a right or wrong general answer here after reading all the responses, but the right answer for me right now is to rent a mini. But I will be watching some auctions for a used mini once I retire, just in case I can get a killer deal on one.