I paid £148 or similar for the cambelt change on my Mk4, but its not the part which is expensive its the labour it takes to get to the old one.
Scratches would have to be filled and then sprayed over, expect an average of around £100 per panel to get them done in the above.
15" alloys with that tyre profile would look OK, but I would definatly try and go for a 45 profile as it looks much sportier and doesn't fill the arches allowing for more lowerage in the future






