Cameronian,
I don't expect that Apple want us to bandy numbers about on here
Indeed. I'd speculate a kitchen-sink sized range of >10 <=30 depending on the configuration, other than that, my lips are sealed.
If going down the student route, don't forget to keep an eye out for any software bargains such as MS Office Student edition.
Mike,
I can't believe I've just read a post which said Adobe had a stable and efficient codebase.
I know, I know, could be debated. But that wasn't the focus of my post anyway, so wasn't meant to be 100% accurate about the perfection of Photoshop codebase. But it's a lot better than it used to be !