It's up to you as far as what you like. A great place to start with for looking at morphs and combos is www.worldofballpythons.com if you go to the Morph List and type in spider, it'll give you all kinds of combos including the spider gene.

Personally I like calico spiders and hypo spiders, but you can't go wrong with a nice bee or a black bee either. It's all dependant on what you like!