FWIW I've still got a ITX board with an Atom N230 and it's awful slow. Just booting the OS, loading up a browser, and updating AV software is absolutely taxing on the poor little thing. I can't watch any HD video online, and without an SSD and ethernet connection any OS updates take a small eternity to complete. They have their place, sure, but to actively be using one is a true test of patience IMO.
There is an Atom thread on here somewhere, so if you're adamant about using one maybe check that out?