I've sworn by Western Digital for a long time and they have been generally trouble-free. I have seen some 4yr+ 20-80GB drives failing recently but they were just disk errors / slow Windows and ghosting the drive was never a problem on these.
In the past year I've installed some Seagate and Hitachi due to better pricing and so far no problems.
a new drive will give you 5 year warranty instead of 1 year that almost all externals give..
rubber feet or base and a nice size heatsink/ fan...
id also like to buy a few new external cases for usb and if possible usb / esata .. i have some lian li and they are working fine but its solid metal and i dont really like the looks... id go with black edition 1tb and what ever case someone recommends