It depends what parts you want?
S3 and jitsie make some great stuff:)
Stuff like master cylinder covers and anodised lever I just phone theese guys and they can have for me in a few days. http://shop.freestylebikes.co.uk/scripts/default.asp
One thing that would look good on a sherco would be powder coated wheels you can get this done for about £150
Google triple s powder coasters.
Anymore questions just ask:-)