Both the doors and the rear deck hold 6.5" speakers, but the doors likely need "shallow mount" to avoid interfering with the window when fully rolled down. The doors also require adapter brackets (e.g. from Scosche).
I like the Sony MEX-BT5700U head unit because it does all the Bluetooth profiles including A2DP and AVRCP 1.3 -- which means that you see the artist and track name on the display when playing music from your mobile phone or iPod Touch.
The
CDT liquidation sale at Woofers Etc. has some good deals. I'd recommend mid-bass for the rear deck and full-range for the doors. (This is assuming you're going to install a 4 or 5-channel amplifier.)
If you're only going to use your head unit's built-in amplifier, check out the 2-ohm speakers from Infinity, such as the Reference Series or Kappas.