The Gun Mod,
includes Cars,
Sentries
Rockets
Rifles
Pistols
Laser Guided Rockets.
Really recommend it.
I only use SPC and TMI, but I suggest you try out the Aether mod
Do you play multiplayer much?
If so xray mods/hacks are very useful along with fly mods if aloud which for that I use zombe mod. I also use mods like optmine I think it's called which gives you more options for video settings and helps users who may normally get less fps get more.