Be careful.. A lot of these docks dont fit the iPod if it has any kind of protective case on it, like an iSkin, agent18, etc. I mean you could take it out of the case, sure but who wants to take it out of, and put it back into a case every day, sometimes more than once? But ts just something you may not have considered..
Also, if its a new 5G, or a Nano, those are thinner than the older ones so theres going to be a little play in the dock which could be possible to stress the connector in the unit. Again, just a little 'fyi'.