After playing a few games, it's become quite obvious that I'm lacking long range anti-armor options in my Ultramarines army. I have the kit for a devastator squad with bits to do 4x lascannons and a centurion squad. I plan on magnetizing the crap out of the centurions so I could do three TLLC and still have the option of grav-cannons or whatever other combination I want. The centurions interest me more than another batch of vanilla space marines, but I'll be doing them both in the end either way. I want to do the better one so I can fill the gap in my army. What would you guys recommend? I'm almost done with the tactical squad I'm working on now and need to take something to maintain my sanity while at my mother-in-law's house this weekend.