[Dovecot] Recommended method?

Hopefully this isnt TOO general of a question.

I have a raid server that runs dovecot and exports via nfs the maildir format store. I have 4 mail servers running exim that use dovecot to deliver over nfs

I have been examing our entire setup and had the thought, would it be recommended to instead have another exim process running directly on the raid server and have my mail servers deliver mail to that rather than over nfs, if that makes sense?

So mail would go from our postini frontend => mail cluster => final delivery via exim on raid server.

Seems like this way I could make all the nfs config options go away and such.

Thoughts?