[Samba] Review for dummies

[mlb]

Ok.  Not newbie, but feel like one.

Here's my question.

I am setting up a computer lab with series of W2k Pro workstations.

What is the best way to administer these with a Samba PDC?

I have NO NT servers, and really dont want one.

My main goals are:
a) easy administration
b) security so they cant crack 
c) most reliable.

Can you tell me if winbind is what is needed?
Or would the best thing be an ldap user database?

Initially about 50 users, not sure of high number of users.
expect about 25 pc's initially.
Mitch