Here are some speakers that are AWSOME for the price:
Soundstream PCS6.5 Picasso Ultra-Range 6.5" (fronts)
Good low/mid range tones, crisp highs.
Soundstream XTS6.5 XStream Full-Range 6.5" (fronts)
Hits a little harder than the Picasso's, but not at the same level of clarity.
Soundstream XSC.6 Xstream Component Speakers 6.5" (fronts)
Same as the XTS6.5, but in a component setup (separate tweeter, crossover)
SoundStream Tarantula SST6.9 6x9" (rear)
Great sound, great clarity. Awsome setup for someone not looking to have subs
Soundstream PCS6.9 Picasso Ultra-Range Speakers 6x9" (rears)
Nowhere near the quality of the Tarantula line, but still a quality speaker, and about half the price.
I've heard all these speakers with my own ears, and while there is better stuff out there, the quality you get for the price you pay is outstanding.