Hi, first thing you need to do is talk to someone before you buy a jogger from just any store. I teach mommy and baby and stroller fitness classes and one of the other instructors bought what she thought was a jogging stroller (the Jeep stroller with the music player) and had problems running with it in class. She was told by someone at the store that it is a "jogging type" stroller not a jogger and that it's not meant for jogging (much to her surprise). So, if you are going to jog you will need a real jogging stroller.
Second, it's best to get a stroller strictly for jogging or running. The strollers that have the wheel that lock are not safe if you are jogging/running. The wheel may come unlocked and cause your stroller wheel to swivel while you are jogging...more than likely causing a fall for both you and your baby.
For an article on choosing a jogging stroller read http://www.babybootcamp.com/pages/fitness_detail.aspx?fci...
I hope this helps!