I've been working on my registry and have done lots of research on infant car seats. I have a few in the running, but I can't seem to find any information that points me definitively in one direction over another - so who better to turn to than the bees?

These are the ones I've been looking at but I am open to other options:
Maxi Cosi Mico AP - love how light it is, great safety ratings
Chicco Keyfit 30 - has great safety ratings, a little heavy, lots of people seem to like it
Cybex Aton 2 - has all the bells and whistles in terms of safety, but is SO expensive.
Chicco Keyfit 30