Rifle: If I didn't go with some crazy expensive double rifle then I would say a FA M4, I think this would be cool because of the various uppers on could put on it (.22LR, a sbr 5.7, 5.45x39, .50 beowulf would all be on my list suppressors to go with them) A Barret Model 82A1 is on my list of wants but I don't see it getting as much use.
Pistol: Glock 18
Shotgun: again if not an unbelievably expensive double than maybe a tricked out, select fire, Tromix SBS Saiga 12 with a MD 20 round drum