For me, it'd be more exotic 72nd aircraft weapon sets or 35th scale firearm sets in injection plastic.
There's a vast array of M16/M4 variants out there, for instance, but precious little difference in available weapons. (Dragon are you listening? - their Quartermaster series are superb).
In a related vein, some modern troopies (also in 35th) other than US. (eg: ADF, Finnish, etc).
Regards,
John