Banding is quite evident and not terribly pleasing. You can minimize it with some pseudo-dither texturing. AA is very smooth but there are a lot of wasted colours there. You're using many colours just for AA (including a couple just for one or two pixels each). When AAing you can often get away with using colours not derived from the colours you are AAing between (so long as they are more or less the right intensity), so the colours in the pre-AA ramp should be sufficient. Quick edit. 10 colours (Yours is actually 19). Colours also tweaked a little (mainly warmed the highlight).
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