Honestly, the one you like the look of. My personal favorite is the albino but it might be hard to find one for $300. You can find lessers, mojaves, spiders, pastels, and several others in that price range though. My recommendation would be go to a show and see what strikes you. Also surf on FaunaClassifieds to get an idea of price on morphs you like. Remember that they are generally a bit cheaper at a show and you can also haggle a little.