Here's what I'll say about a backhoe on a tractor. If you can sit there and write out at least 2 or 3 things that you think you would repeatedly use it for over the next couple of years, get it! Examples: you have a lot of small trees to take out and you plan to do it over a long period of time or you plan to plant a lot of trees or digging lots of rocks out of the ground.
But, if you only have a couple jobs that you think you'll use it for but the rest of the time it hangs off the back and is a PITA to get off and on when you want to use 3pt. don't get. Rent a true excavator.
Just my opinion. I've owned tractors for several years and have never felt I needed one. But, your needs are not my needs.