Well, size wise a 250GB would probably fit the bill. 8meg cache should do,
unless you find a good deal that has 16. USB2 for connection. The only
problem i have, is that Maxtors are very popular, BUT, i really can't force
myself to recommend Maxtor, as i've had many die early deaths on me.
That said, those bad experiences were with internal drives, but external is
the same, with a different interface, but more heat to deal with. So, i say
anything BUT Maxtor. I know people are going to argue this though.