Car seat/travel system

Jennifer
Does anyone have any recommendations on car seats? Or travel systems? I'm looking at Graco and Britax, but I'm hesitant on Britax because of the price! However, I want to get something safe! I live in an area with heavy traffic and people tend to get aggressive so that worries me! I'm open to other systems as well! Any reccomendations are very much appreciated! 
Since my son will be born in October I'm wondering if I will even use the stroller system with the weather!