Deft tech's are real nice. As are Klipsch, and Energy. All have a slightly different sound, head to a store and try them all out.
The easiest thing to build yourself is a sub. There are some fantastic kits out there. There are also speakers that you can build, but they do not use car drivers. If you want to try diy speakers, check out these kits:
http://www.gr-research.com/