Choose wisely!

3, 7 in is enough to travel through a few mm thick steel wall

7, being able to see through the walls of an actual container can save some time while robbing them

Also,

5, controlling a toaster with your mind is like controlling a pretty impractical relay. Combine it with amateur arduino skills and you can actually control any electro mechanical device with your mind. In that case i would pick 5 and 2. Selling the gravel will pay for the expensive hobby