i think you cannot go wrong with the BEL gene complex, that means butter/lesser and mojave, and also with fire. also you cannot go wrong with pattern morphs, you say you dont want a wobble, so how about pinstripe. enchi is (at least for breeders and in combos) always rewarding.

within your price range, and with your demand that they need to get better with age, or at least stay the same, i think its down to BEL genes (butter or lesser or mojave) and fire.