Honestly, I would just go to a couple reptile shows in person, preferably big ones, and pick out the best pastel you see. They'll all brown out, but the best one you see in person is usually going to beat any random pastel you buy online after a few years of growing.
If you REALLY don't want them to brown up, spend the extra on a pastel mixed with a clean-up gene. Like a firefly, etc.
EDIT: Or spend the extra money on the best pastel someone like NERD or Garrick deMeyer has in stock. Usually if they say it's a stunner and are charging twice or three times as much as everyone else, it really is something special.
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