Ok I signed up because this thread is full of /facepalm responses.

Good job on switching over to dumbbells, they are MUCH better than using the bar. When you use a bar you are missing out on working the stability factor of your joints. So I ask you, what is strength without stability? Nothing.

I see this thread similar to: what's better Leg Press or Squats? Use dumbbells. That's the way to go.