Amplified speakers will be a little more work with wiring, do you just want plug and play ones? Also depends on price range. On the cheaper end of things I've had Pioneer speakers and they do a great job for the price, and then on the higher end I've had JL, Polk, and Harmon Kardon, although the last two I think a lot of it is hype with those brands. I'd agree with the JL suggestion, but look around for what you want. Oh, and the speaker dimensions is 6 1/2" all around. Good luck.