.44 mag revolver (scoped, heavy frame) - I like it for close range sniping when I'm sneaking in tight areas
assault carbine (extended mags) - cheap ammo, good damage - would kill for a red dot sight on it

anti-material rifle (no mods yet, using WMX) - now that I can afford the ammo pretty easily it's a beast
and a couple of grenades (all the explosion perks)
I'm still a FONV newb though, so I'm sure these will change when I find and try out new weapons.