There is a line of Seagate drives called freeagent I think. One version comes with a Gigabit base. They're cheap too. And you can reuse the base with any sata drive.
Edit: link. http://www.amazon.com/gp/aw/d/B0068PONMW/ref=mp_s_a_19?qid=1330798322&sr=8-19