Price seems a bit high to me but the 04/06 is my favorite generation. The main thing that you need to do with any r1 in those years is replace the rotor with the updated part. The rotor/stator assembly rotor. It has exposed glued magnets that have been known to come loose and then you have magnet debree throughout the engine. This was my first upgrade when I got mine. It also goes for the 07/08 model as well. Other than that they are great bikes.
04 R1 Gilles rear sets carbon fiber front fender,chain guard ,dash panels and heel guards. Pirelli supercorsa v2s my baby