Hmm.. not sure what the difference is between brush and colored, but whatever the basic one is, I got it anodized in blue.

If you can get it sanded to flawless condition, then get it anodized.
If not, go for powdercoating as it also looks gorgeous.

On a bike, powdercoating is pointless, as it adds weight. Anodizing added 3grams to my bike frame (I weighed it

Just make sure there are no rivets, as it will melt any steel. That being said, your case is absolutely amazing. I would love to be as handy and precise as you are