Personally i prefer the Infinity Referance speakers, they have about the best Signal-to-noise ratio of most speakers in it's price range. However, they can be expensive. The 6.5" are going to run about $100 for one pair. I've had the 5-1/4" for my front and rear (they are bout $10-20 cheaper) for about a year in my old accord and they are amazing.
Tip for putting in the speakers, be very careful not to jump the screw head with the screwdriver. Would advise against using an electric for putting them in. Why? VERY VERY easy to slip and destroy the cone or surronds of the speaker. A screwdriver will go through them really easy. Just be careful and you'll be fine. Took me about 10 mins to put in my fronts and 15 more mins to put in my rears.