Black and red looks a little bit cheap, in my opinion. If I was casing a top-class amplifier, I'd want it to look like a top-class amplifier, and not a video games console. Silly little coloured rings around the outline of the case and the volume knob just seem a little bit tacky. It does look exceptional when a lighted ring is used, however, such as in kramathis' case.
I also agree with the others about using the greek letter for beta.
What is the material that you are using for your case / front panel? If the plan is to use acrylic (similar to Amb's B22 case), the black gloss could look quite good. I'm not sure about black a full case of black alu, though - they always look so 'mid-fi' *shrug*