The Baby Trend Flex Loc carseat is cheap and easy to use.  Also, I did my research prior to buying and it is highly praised for it's quality and value.  The best part, however, is the stroller you can get to go with this, it is small , cheap, and light and maneuvers fantastically!  I plac to use the same system for my next baby.  The bigger more expensive travel systems are bulky and not user friendly.