The CSL was the holy grail of the legendary E46 M3, but it had 2 main issues - you can only get it in silver or black, and it only came in with the SMG gearbox. So what is the best thing? Build your own E46 M3 CSL in your preferred color and with a manual gearbox, and in the UK there is actually one car that I know of that has gone through an extensive CSL conversion.
For reference I'm including the magazine extracts, photos, and full parts list to whoever would be interested in doing something similar.
For ease of use and since some parts may be out of production, all of the below part numbers are linked to ebay listings, as your best bet is to find someone selling used or new old stock.