Which Samba - 3.0.x, 3.2 or 4.0?

[Arup Biswas]

Dear Samba Members,

I would like to hear your insight on this matter.

We are using Samba 2.2.x in release 1.0 of our NAS product (still in the
stealth mode). In a month we will start working on release 2.0 of our
product where we intend to add ADS/Kerberos/LDAP support. As it stands 
today,
I can see three choices for the upgrade:

1. Re-base our CIFS code base to Samba 3.0.x ( whatever the value of x in a 
month or two)
2. Re-base to 3.2
3. Re-base to 4.0

FYI, we are using very limited features of Samba:

- file sharing
- authentication
- naming and browsing

In other words, no printing support, we do not want to become domain 
controller or WINS server, no user-group mapping
support etc.

My question to you are the followings:

- If I have to start working on the re-base work in a month or two - which 
option would you recommend 1,2 or 3?
- How long should I wait before I could  re-base to Samba 4.0?

Thanks in advance,
-Arup Biswas