Hi! The Chicco is a GREAT seat for smaller kids. A friend has the Safeseat and its wonderful. I've never touched the Snugride 32.
If I had to choose an infant seat today, I would choose the Safeseat because I know I have bigger babies.. (8.5lbs and 9lbs) and I know that both my boys were out of a conventional (max wt 20lbs) by 5mos old, so I know their growth curve.
HOWEVER when your child starts sitting up, you could easily use the basket at stores for them to sit in instead of the car seat. I never brought the infant seat into stores, I used a sling... but just going to Target I see that 99.99% of all moms use that infant seat all.the.time.
So it just depends on what is important to you. Do you really want to use an infant seat until your child is 30lbs? Most kids make it to 5-8mos in the conventional (22lb) infant seat, then you purchase a convertible to keep your child rear facing to 33lbs/2yrs old (AAP recommended) and then it becomes a forward facing seat to 40, 50, 55, 65lbs (depending on model you purchase).
If you want to us the infant seat until 30lbs, then purchase the safe seat or keyfit. If you think you child would be in a regular infant seat to 6mos, then switch to a convertible car seat... then do that.
go to Babies R Us or USA Baby and try them out, play with the buckles, lift them, push the stroller. We had both an Evenflo and a Graco stroller and both were junk.... they didn't push well in anything but firm flat concrete, and they didn' turn well, the wheels were shaky.... but I know they've made improvements. Check the ease of folding, the harness in teh stroller, etc too.
But go play with them, one will be easier for you and you will know.