If you're looking for photo etch (PE) stuff, there are lots of them. Eduard and Aber are probably the most prolific, but Airwaves does a few sets (they mostly do sets for wingy thingies!) and Parts has quite a few. Lion Roar has recently started importing stuff that's pretty nice. For barrels, look at Jordie Rubio, Eduard, Brass Barrels, Aber and Lion Roar. For resin detail parts and conversions, there's Royal, Jaguar, ADV Azimut, and many more, I'm sure. Artisan Mori has a few really neat (but pricey) things. They are imported by missionmodels.com.
The best way to find something or see what's available is to go to one of the online mail order houses and take a look. Internetmodels.com, greatmodels.com, missionmodels.com, rollmodels.com are just a few. FSM lists some of the online houses near the back of every issue.
I'm sure others will add to this list!
Good luck.
Bill
==========================================================
DML M4A2 Red Army
==========================================================
==========================================================
-- There is a fine line between "hobby" and "mental illness". (Author unknown)