F250's come with a 2" block in the rear. A 2" spacer in the front will leave a F250 sitting level. With this kit you will be adding 3.5" in the front and 3" in the rear, leaving a 1.5" rake.
You can add a little more cash and get a decent 6" lift.
6" 05-07 Ford Super Duty 4x4 Fabtech Basic Lift Kit - Top Gun Customz
Or for about the same amount of cash you could get a 4" lift with full height springs instead of spacers.
4" 05-07 Ford F250 Super Duty 4x4 Skyjacker Lift Kit (Diesel) - Top Gun Customz
I am not knocking the ready lift kit nor am I a rep for top guns just giving my personal opinion with a budget in mind.