1) Those that are offered by MM, but not available on the model I'm interested in
2) Those that have been available but are now discontinued.
Having said that, MM finishes are always really, really good. Also, without exception in my experience, they look better in person than in photos.
To actually answer your question, though… from the current colors I'd have to say Black Cherry Burst or PBB. I think I'll really like Tangerine Pearl once I see it, though, 'cause I have a thing for orange basses.
Well, yesterday when I asked this question my favorite color on a Sterling was Pacific Blueburst like on the one I have now, but I purchased a Sterling in Honeyburst today which might change that. I'll post a picture of it when it arrives on Wednesday. So for now here's the Blueburst.
I love the Pearl Blue. In fact, I have thought about eventually getting one like in the picture below to compliment by Natural Sterling 4H. My next Music Man will be a Black on black Stingray Classic with a birdseye maple neck and then possibly this exact bass below. After that, a black Reflex with the Game Changer.