Linux File Server in an Microsoft Domain

[Bryan.ONeal at asu.edu]

Ok, I am about to add a file server into our Microsoft domain (I hope)  I have
looked at all the read me's and it seems that samba 4 should handle the
Microsoft permissions no problem.  I am looking at either SuSE 9 Enterprise or
Red Hat Enterprise.  Any thought, recommendations, experiences, or warnings? 
It's for my work so I am quite nervous.  I real would hat to have them drop $3K
just to tell them “Opps! You have to drop another $8K to make it work because
were going Microsoft.”

1) Has anyone ever done this before?
2) What can you tell me about doing it?
3) If I were to choose SuSE vs. Red Hat as an file server that is integrated
into a MS Active Directory, which would you recommend and why?