As others have said M416 FTW
I'll also suggest the FAMAS, IMO the Aug had too much recoil in scope for me and i found it didn't have enough "stopping power" in CQC
However i haven't used either recently, its quite possible the stats are/where changed.
As for SMG's i don't really use them, but i'd go for the UMP, MP5,P90 or PP-19