which 6" x 9"s

Aiight, my friend blew my 6 x 9's in my civic, so I have to get new ones. Can't decide between
Pyramid 6694's http://www.pyramidcaraudio.com/itempage.asp?model=6994 ($37) ,
Pyramid 6959's http://www.pyramidcaraudio.com/itempage.asp?model=6959 ($48) ,
Audiobahn DUB269's http://www.millionbuy.com/adbdub269.html ($70) or
Boss Ripper 6904's http://www.bossaudio.com/products/print/rip6904.htm ($53)

My old speakers were sony xplods lol, going to replace the front door speakers soon also, those are also sony xplods. Using the amp in my head unit which is also sony xplod, and using factory wiring..

I would personally buy Infinity's. But if you on a budget any of those look fine except the audiobahn's. It's only a 2-way! you will only be pushing 22 watts to the speakers so any of them will handle it.

Which would sound the best?

I dont know which will sound the best. They will all prob sound about the same. Get three way speakers if possible. It will make a bigger difference with the highs.
If you arent going to run amps to the speakers, you might as well get the cheapest ones.