I suggest shook's mods, all of them, there is a topic called "Mah Hueg Mod Pack" download that, it'll take you awhile to get through all of it. Alot of it isn't balanced, but is sooo much fun to use.

It's just one weapon and a resprite of another mod actually (which replaced the old sprites, so there's no real point of them to be in my topic anymore ), but thanks for the publicity anyway.

As a lot of people here said, I suggest Shook's pack of mods, the AAL faction, the Crobos, the DarKlones and Legio Machina.

These are bigger-than-average mods (especially AAL) so you might not want to use them all at the same time.

For smaller mods, just do what Azukki says, download all the ones that interest you and just keep the ones you like. Just take care to remove some mods (remove the .rte from the folder's name) every once in a while so they don't clutter up or make the load time too long. ChJees' mod managing tool is infinitely useful for this (and everything really...).