I like the AUG better than the Famas. I pretty much feel the same way as demon. AUG just has a better feel to me. Famas feels too loose. I played with both last night.
If you're going to use the AUG then I think Scavenger is an absolute must.
I also used the Commando for the first time last night and that gun is going to compete with the AUG.
Other than that I don't know. I used to love the Enfield, then the Galil, but that all changed when I used the AUG. I'm not a huge fan of the AK74u. I've used the AUG too much to change to a SMG now.
Maybe some day I'll experiment with the other guns and end up liking them all. Just like in MW2 I used the UMP so much, then I went to the ARs, then fell in love with the Tar. I miss that gun.
Then loved the Uzi. Then found OMA.