Convertible car seats!

Tayler
If you are using a convertible car seat are you getting a infant one as well for easier transportation or no? If no, what are ideas on what to use instead that is convenient! 
I got the Graco Contender 65 convertible and every time someone asks about the car seat they always say that I'm gonna want an infant one! I just don't know if I need to spend more money on a second car seat...