Not sure what the ATI situation is like, but with nV I found it's an awful lot easier to go the nV installer route than the repository route.Vendors sites (like Windows) or the built in store (Known as a repository).
Humm i say gentoo is a good place to start (provided reading is your fortay)
But dont really bother with 64bit yet, you can adress 64 gig of ram in 32bit linux with a pae switch in the kernel which works pretty well.
To be honest - I don't know why you keep recommending Gentoo for new users: it's almost guaranteed to put the majority of them off linux for good.
To be honest - I don't know why you keep recommending Gentoo for new users: it's almost guaranteed to put the majority of them off linux for good.
I agree that Gentoo is a very good way to really get to know linux, but most new users will be coming from a Windows environment and will want something that just works with no faffing.
For example - Portage is an excellent package manager that gives you a phenomenal amount of control over your system, but generally, for new users - it's hard enough for them to get their heads rounds apt / yum / pacman / whatever, let alone setting use flags, etc.
OK - so this isn't true for every new user - but I'd say it is for 99% of them.
One of Ubuntu's strengths is the enormous amount of How-To's and forums posts about just about everything.
There will be a howto/wiki for both nV drivers and ATI drivers, and sound is handled very well by ALSA, which is already installed but may need a little configuration if you're fussy (like me).
...and Mandrake isn't?!?Mandriva!! I would say Ubuntu is more aimed at schoolboys.