I've got a set of caramba sidewinders that currently aren't in use. Here's a stock pic link, mine have a standard spider rather than the cnc all in one chain rings, so you can choose your own rings (5 arm compact): http://fcdn.mtbr.com/attachments/vintag ... aramba.jpg
I'm after something more rounded, like Cook Bros style. I probably should have said in the OP!
The roox are most likely fine to anodise black, assuming all the bolts can be removed as can the spider.