Check out
Woofersetc.com the online car audio super store, the largest selection at the lowest prices!. They have pretty good prices for the quality they carry. Most on here recommend component sets. I am running Infinity Kappa's in the doors w/ stock tweeter and HU. I did this swap the 3 days of ownership. I am still debating if I want to invest in a component set. I guess I will set want it sounds like once I am done. I am going to install a 12in sub and amp everything once I get the speaker box.
Ikesound.com has good prices too but isn't a authorized dealer. The warrenty is through the site. It is were I got my infinities that are in the doors. they are legit.