I have a SE 2.0 (base-model) Caliber. I am currently looking for some new speakers and possibly a head-unit. From my understanding, the speakers are probably one of the easiest upgrades in the Caliber. In fact, it is probably something I can install myself. As for the head-unit, I've heard the base model stereo (CD/AUX/Satellite/AM-FM) is a 1.5 DIN. Is this correct? Also, I am looking at getting a navigation head-unit. Any recommendations on a brand that carries 1.5 DIN navigation units. I am really open to any navigation unit, as long as it is easy to moderately easy labor. My concern is that I will end up having to buy a 2 DIN and THEN try and make it fit somehow. Not sure how... anyways, thoughts or advice would be great. Thanks in Advance!