Most shocks are just there so guys who used to do skateboard stunts as teenagers can feel "cool"- another marketing ploy. Unless you are hurtling down mountains or leaping over cliffs, all they do is add dead weight. (or so my wise DH says) Sort of like when suburban guys buy pickups when all they do is ride to the office on a highway.
It's great that the guy is willing to help build a bike to your specs- but make sure the frame is the exact right size for you to begin with, BEFORE he starts swapping stuff out and tweaking it to "fit" you. Be wary of buying a bike that is not your perfect size just because it's there in the shop and then depending on him to change stuff around so it fits better.