New car seat?

Korky

I'm looking to buy a new car seat for my son. He is 6 months and almost 20lbs. He is getting big so fast so I would like a convertible one so I don't have to get another any time soon. I have looked into the graco 4 ever one but it's almost $300. I don't have to have one that is forever as long as it is rear and forward facing. Also I have a small car and would like it to fit somewhere other then the middle. Does anyone have any suggestions?