Well, IMO, you only need a new barrel (not badly, but it would help), a new reg (especially if you run an HP tank) and then a CP bleed ASA would be great, mostly because I like to be able to degas my gun after a match without unscrewing the tank, or popping off shots.
I like the feedneck. The trigger feels fine, though I guess a lighter switch couldn't hurt ( the trigger is really personal preference). Drops are personal preference, and while you may think you like a certain style, you might want to try out someone else's drop before you buy. Make sure you try snapshooting in your favorite positions, that way you know what truly works best for you. I used to like having a 7" drop forward on my spyder, but I found out that I couldn't hit the broad side of a barn with it (not to mention the inaccuracy of the gun itself). Then I got my NME with a rail and tried it out. I was able to snap shoot within two inches of my friend's head at thirty- thirty five yards.