Hoi Chummer!
I am in the same boat as you
My favorite supplements, in no particular order:
Maximum Metal: Why? well duh.. more guns and stuff. Good rules on explosives and solid rules for running ACPA...altho PCs in walking tanks can get dangerous, its still a cool addition to Arasaka's security perimeter
![Devious :] :]](http://www.enworld.org/forum/images/smilies/devious.png)
Also has some good vehicle stuff
Grimms Cybertales: {I think thats the name..} This is the one with the expanded cyberphychosis rules. Much much better than the core rules.
Chrome Berets: A module without any new rules crunch.. but damn good module.
Tales from the Forlorn Hope: A series of modules based out of a tavern in Night City... again, no new rules crunch...
Ocelot's Drug rules: well, free online stuff counts, right? Found this gem over at Blackhammers site, along with a plethora of other cool stuff.
These are on my list of need to restock, except for Max Metal and Ocelot's rules.
The guys who wrote Grimms' also did a good module that included some crunch on deep sea exploration... "Sub-Attica" IIRC.