I like Funskool. My Night-Viper army is exclusively Funskool (with the backpacks dyed black), so is my small Toxo-Viper army of two. I also have Funskool Roadblock, Psyche-Out, Beachhead and Big Brawler in my collection (although Big Brawler's had some touch-ups to be even MORE Brawlin') and I've used Flint, Tunnel Rat, Wild Weasel and Metalhead for customs.
I also have that Battle Hawk helicopter. It's unique but it'll take a lot of modifications before it's compatible with 3 3/4" Joes.