Vibration and shaking - need input on possible causes

[sasquatch]

I have a noticeable shake/vibration which is worse at low speeds. First thing in the morning when I'm leaving the house it feels like the wheels are severally unbalanced...the car wants to bounce up and down. I had the tires replaced a few days ago and balanced twice but it is still there. The tire place said the wheels did not appear to be bent. So, I'm suspecting something in either the suspension or maybe the driveline like the drive shaft and carrier bearing. The problem seems to be speed related. I'm at a loss right now. Any suggestions besides the obvious "bent wheel"?