Help with my first engine build (5.9 Magnum)

I was lucky enough to find another machine shop to do some work to my block. I was fully planning on putting the motor together as is, however this family owned shop quoted me a price of $7-800 for all the work I mentioned above (minus crank balancing, all they can do in house is polish and mic it to be sure its in spec). After talking with the guys at the shop, they told me that I won't need to get the rotating assembly balanced, as long as I'm not racing the motor. They said if its not living up above 6000 rpm it isn't necessary. My plan is to simply drive this car, but not race it. It rarely should be up at 6000 rpm.

Do you agree guys with their opinion about balancing? Or am I asking for trouble?...