Active Directory or Open Directory in a Windows based college, you thoughts?

[b]I wondered what your thoughts are on this. As you may have seen in my other post, we are a mainly Windows college so using AD would be very beneficially for our users. I wondered how many other people have looked into this, and what did you decide, did you keep the Macs a separate network, or did you go ahead an use AD. What problems did you have?[/b] Using OD we would have a completely Apple based infrastructure from server to client so would be fully supported. I expect all the features of 10.5 server to work well such as wiki etc, and there would be no saving problems to drives etc. We could also use mobile home directories on laptops. We would not need to worry about the plugin braking between our OD and AD system, there is less to go wrong. The downside of this setup though is that it is a separate infrastructure with extra admin overhead. I would need to spend time importing users each year, and users would need to keep separate login details for both systems. And then when accessing the college systems such as the intranet, they would have to remember to input their AD credentials. Also connecting to windows network shares would requite their AD details again. Plus I dont know how well it would work with out web proxy and wireless authentication. Using AD would mean that users have a single login for both systems and can access the same files and folder over any machine. There are quiet a few downsides though. The biggest being that we are working with two different directory systems and there is more to go wrong! When we tried this in the past we found that the network home folders when using AD used th smb share so it was nice that the users could login to the pcs and see the same files that they do on the macs, but certain mac apps didnt like saving to a smb home and had various problems such as Office would let users save sometimes etc. So what do you think, are you using AD/OD and happy?