Shopping for Baby

I nearly titled this post: Do Babies Really Need All This Stuff? or Shopping for Baby: Send Help! I've started the process of researching and registering for baby gear. There's a whole world of car seats and carriers that I know nothing about and sifting through online product reviews is like a form of self-inflicted punishment. Plus, everyone seems to have a different opinion about what's best. When I feel overwhelmed, I find myself drawn to more manageable decisions like choosing clothes and room decor. Like how cute is this hot air balloon mobile? I think I'll buy it. See how easy that was.
Any must-have suggestions or advice from you mamas and good shoppers out there?