I am not a big fan of the Nemesis Either. The two mech mods I've really enjoyed, was the
Caravela mod and the
King mod (no logo) The caravela's might be a bit picky with different batteries, since there is a fixed size center pin, but that is rectified by having a slight gap by the locking ring. The King V2 mod I love, but it's a matte finish and a bit heavy. Both have very good locking mechanisms with a 1/2 turn to lock, but I use the King mod more because you can set it down on a table without having to worry about it firing or if it's locked.
I have been looking at the
Stingray X, but I'm afraid it's locking ring is threaded 20x.5 which means lots of turns to lock it like the nemesis. It does look good though. The
SS 49 mod looks nice, but I'm afraid it'll be finiky with the batteries due to it's design. This
Cartel mod looks nice too, but man, it looks HEAVY.
As far as an RDA, the
Patriot is good if you don't mind drilling out your own airholes.. it's price is right, has dual o-rings, and uses a phillips. The
Helios might be easier to work on.