If you have a chance, go to USA Baby, they are very helpful and more than willing to give you the pros and cons of each seat (even if you don't end up buying it there). We have a Marathon that I love, and a Maxi Cosi Priori that we really like too. They are both very safe,the reason we didn't get the Blvd. is because the sales person told us when a child gets a little older they can get frustrated because they can't see to the side and have to try to bend forward to see out the side - which is probably not super safe.
As far as turning your child around early (mentioned in an earlier post) I would NOT recommend that, even if your child is tall... my pediatrician recommends rear-facing until two years old and gave me statistics in regards that were something like from age 0-1 rear facing prevents death 50% of the time and from 1-2 rear facing prevents death 80% of the time, and even if a baby's knees are bent only like one in 150 accidents had a broken leg - which is better than a broken neck in any case. My son is 14 months and still rear-facing. He has an appointment in October so I am going to ask her how she feels about turning him around. If she recommends that he remains rear facing I will follow her recommendation.