Head over to Doublebugs blog and win an Evenflo Triumph Advanced LX car seat.
Some nice things about this is the shoulder straps are dial adjustable and the harness uses Infinite Slide which makes it simple to do. You can use this seat for infants rear facing 5-35lb and forward facing 20-50lbs.
It is the no.1 rated convertible car seat for performance and price by leading consumer magazing.
Many more features can be found here.