I didn't like the line gun because the space between shots was too wide, hard to hit smaller things. The Ripper was fun but there were too many times when I was so close the blade was actually on the other side of the enemy, spinning around in nothing. The contact beam was okay, and the pulse rifle was nice, but unless you upgrade the damage it sucks.

Edit: I am going to start going back through it and upgrading the rest of the guns. All of my equipment plus the cutter are already maxed out. Got the military suit, too.