First you need to plan what you want to do with your tank. Decide what types of things you want to have ex. Fish, Types of Corals, and then decide what type of lighting you need from there. Then just do a search on the net or check out the sites that people occasionaly mention.
depends on reef if you want to stick to low to med light stuff or go for high light stuff (low to med light vho $200 to 250) (high metal halied $450 to 700)