I really would love to run a space marine list that is as shooty as possible with a decent amount of bodies so I essentially dont cry every time I roll a 1. Unfortunately my knowledge base of marines is only from my experience playing against them, and thus I would really like to here from everyone as to how best to accomplish this and why, before I start piecing together an army so I dont wind up with a box full of $40 dollar paper weights.

Thanks in advance for any help.