When you say toddler, how old is your child?
Are you familiar with the current recommendations? Forward facing seats are not appropriate for 1 and 2 year olds (this rules out the Frontier and any other combination seats.)
Kids that age need to be in rear facing convertibles. I do not recommend the Britax convertibles. With their recent design change they've quite absurdly shortened the shell. This means unless you have a smaller-than-average/petite framed child, your child will not fit in it rear facing by height as long as he/she needs to be.
If you post back with the age/height/weight of your child, and your budget and the vehicle the seat is going into, I could make some specific recs
By the way, there is no such seat as "Graco Generations". I'm not quite sure what the previous poster is referring to. For convertibles, Graco currently manufactures the Comfortsport (don't buy it!!!) and the My Ride 65 (usually a great option).