whats difference between an 05 cooper s and a 04,03,etc... ?
anything that i should look for in an 04?

 

Someone posted this link the other day if you are looking for the older model (02-06). It should help you with all the changes etc. Seems like most kinks were worked out by 05/06 model years.

http://www.motoringfile.com/mini-r50r53-buyers-guide/

 

One of the biggest differences between a 04 and 05/06 is the headlights if you get them with xenons
here is the pre facelift 02/to mid year 04


Here is the 05/06 look



Get the lowest mileage one you can and make sure if at all possible to get an extended warranty.