I'd like to upgrade the factory speakers in my Dodge Caravan. I'm not looking to spend crazy amounts of money. I just purchased a Clarion CZ702 head unit for it. Crutchfield says my van takes 5 1/4 in the dash, 6 1/2 in the front doors, and 6x9 in the back. They've recommended Pioneer speakers. I'm just looking for some recommendations on some mid-level, good sounding speakers.