You could also take a good clone of a beer in the same style and color and convert the grain bill. There is a good paper by Ken Schwartz on converting all-grain recipes to extract or partial mash here http://home.roadrunner.com/~brewbeer/extract/pres.pdf
. Whatever you do though, do not over-steep to get more color as it will extract tannins that attribute to off flavors. Also, a little crystal goes a long way, so know what you like in terms of sweetness and body before adding lots of crystal (don't quote this sentence out of context hehe).