My favorite weapons from the original 64 Goldeneye was:
Moonraker Laser- infinate ammo and cool 'zap' sound
RCP90- ridiculous fire rate with 80 round mags
Cougar Magnum- fires through doors, nuff said
Rocket Launchers- Freakin Rocket Launchers!!!!
Slappers- kinda pointless until you run out of ammo, then it was AWESOME FUN!
I'm thinking the Moonraker Lasers would be the best addition to the new multiplayer mode. IMHO
PS- most hated 64 Goldeneye weapon...the Klobb, remember those? What a pathetic curse to be stuck with that while your opponent picks up a granade launcher and body armor. Ahh good times.