I hope you brought KY. Asking that open ended of a question is just going to get you raped. What you need to do is give us an idea of budget, whether or not you will be changing out your factory deck, whether you will amp your mids or not. At that point people will be able to offer you good suggestions that will fit within your budget, listening preferences, and available power.
The best speakers....well firstly, that is a biased answer, secondly the most agreed upon best speakers will run you well over $20,000 for a pair.