Yes, the Britax "issue" is that in general, the top harness SLOTS are lower than many other seats available. I have not heard of any short-strapped issues with newer Britax convertibles. The Britax seats do not offer the same amount of leg room for RF (possible comfort issue) and less room to grow by height (both RF and FF) than many other seats. The seats are still great but not always the best value/fit.
Quick question - what infant acrrier do you have? How much does your DD weigh and how much shell does she have left over her head? Some infant carriers have adjustable straps where you can let out extra length as the baby grows, so it is possible that this is your issue.
The seat recommendations would depend on your DD's stats, especially weight and torso height (bum to top of head for RF) as some seats are better for taller kids, some for heavier kids, etc. The most important thing though is to plan to rear face your child for a long time, at least until age two but preferably longer, since RF is so much more protective in a crash. Many seats available now can RF a typical child to 3-5 years old. :thumbsup:
[ame="http://www.youtube.com/watch?v=kvyIv9QVRBE"]YouTube - Rear facing is safer[/ame]