Surefire X300 on the main rifle, Surefire Scout light on the backup, Surefire integrated forearm light on the shotgun.
If you're serious go with Surefire. I've been using their lights since about 1991, and I can count the failures* on one hand. Surefire has always fixed my problems quickly and w/o any hassle.
BSW
*Not counting batteries . OTOH, I've never had a Surefire be unexpectedly dead when I picked it up. When they start going dim change the batteries.