For crazy saturated colors (daylight film): Fujifilm Superia Reala (ISO 100)
For B&Ws that can be processed in any color-film lab: Kodak CN 400 (ISO 400)...if you want true black and white films, than you either have to process them yourself or send them out to special B&W labs that are moderately $$$.
But if you are interested in true black and white, than the Fujifilm Tri-X 400 (ISO 400) is a widely used film.
Some say that the only advantage that film has over digital now a days is...slide film. And if you're to attempt to shoow slide (by the way, alot of mini-labs, including walmart, process slide films), then you gotta use Fujifilm Velvia 50.
Ofcourse, you could always go for the regular FujiFilm Superia 400 that they sell everywhere, and to be honest, I really like the results.
That's all I can think off the top of my head.