Blargh, had a huge post and my browser crashed! Let's try again.
All carseats are safe. Some have better "creature" features that make them easier to install, more comfortable to ride in, etc. But they are all safe. When I was looking for a seat for DD, I ruled out the Britax models because I wanted a convertible I could use from birth and historically, Britax models don't work from birth for most babies because their lowest harness setting is too high. So I got the Graco MyRide 65. I love it. It's comfy, easy to install and adjust and not too expensive. DD also uses the Cosco Scenera in DH's car. It isn't as comfortable and I wouldn't want her to have to ride in it for long periods.
Little ones in booster seats, either high back or backless...not a good idea. Kids should stay in a harnessed seat until they outgrow it and then move to a booster until they are ready for a seatbelt only. If a child fidgets while riding or falls asleep in the car, they should not be in a booster. The chance of them shifting and then not having the seatbelt on them properly is too great. I don't know any 2-4 yr old that doesn't fidget and shift in the car or fall asleep at least sometimes on trips. Usually around 5-7 years old, kids are mature enough to start using a booster.
We finally got DD's potty issues solved! Took prune juice to get things moving but she's relatively back to normal now. She even signed "eat" today! I think part of the problem was she ate a lot more processed food this weekend. She really enjoyed the Boca burger but that's one of those things where sometimes I think it would be better to just give her a hamburger made from quality ground beef rather than the over processed fake stuff, you know? Tough call.