Any nice weapon mods/packs out there? I'm looking mainly for assault rifle and sniper rifles, preferably modern ones that are suppressed. I know I've seen a few SOPMOD AR's with M203s but don't know where to find the files. Thanks for any help!

Well there`s apocalypse and Xcalibr. Xcalibr`s probabaly your best bet. It should be on the Nexus, except you`ll have to find the weapons, although in Xcalibr you get rewarded weapons for doing certain jobs. I have one suppressed sniper rifle and even a supressed semi-auto. Sweet weapons.

Definitely Definitely Definitely Definitely Definitely Definitely http://www.fallout3nexus.com/downloads/file.php?id=3388!
I installed it a couple weeks ago and have been blown away with how great it is. It does require FOSE, but that should NOT put you off.
It allows customisation of exisitng weapons, adding silencers, scopes, extended magazines etc.

Plays nice with eXcalibre too!