Car Speakers Help

I'm going to upgrade the speakers in my truck. The only ones I have left are the ones in the back. Two 5x7's. I found these on Crutchfield but I don't know a whole lot about how to judge speakers or what to look for/ avoid. Any help would be great. 

you should try to match the source's max WATT with the RMS wattage of the speaker.

Will do. Thanks

which head unit do you have ? are you using amps?  Some good car speakers, are  Rockford fostgate, JBL, Herz, Pioneer. Kicker., Mtx, Bose.

Kicker makes a good entry level car speaker that can be amp powered or run off a head unit. They are cheap and extremely durable. I highly recommend you check out kicker.