Stainless lines (flush your fluid if you haven't in a year or more) and performance pads are really all you need unless you are hard core racing or on the track. I would never go with Brembo again (they made the calipers on my ML55) as they refused to sell me new seal kits for the leaking ones I have but would sell me new calipers?
If you want to paint your calipers, here is source where I shop and I can offer you pads a bit cheaper than they have them. I currently run EBC Red Stuff ceramic pads front and rear but beware, ceramics typically make more noise, especially during brake in. http://www.sfxperformance.com/search...ems&type_id=34