iTouch, is 8GB enough?

I might get an iTouch but I want to make sure 8GB is enough for me b/c I want to save money. This is what I will use it for:
- a few essential nursing programs (drug guide, etc)
- not many songs
- barely any pictures, no movies
- a few fun apps for when i'm bored
- whatever apps i need for organizing my life (calendar, tasks, planner, etc)

Can someone tell me what the the average size of an installed nursing program/app? I dunno how many of these I can fit onto this thing.
So is 8GB enough? Thanks for ur help guys!