M.
I have a Boulevard for my 1 year old. It goes up to 65 lbs and can be rear and forward facing. My 4 year old daughter is in a Regent which goes up to 80 lbs, but it is forward facing only. It has a min. weight requirement of 22 lbs. I will keep my son in the Boulevard until he is 65 lbs and transfer him to my daughter's Regent beacause at that point she will have outgrown her seat. (They are almost 3 years apart) Here is a website that might help you decide which seat is best for you:
http://www.kyledavidmiller.org/
Watch the video, it's heartbreaking but super informative. If you search throught the website they have all sorts of wonderful information.