Hi K.,
I have a 3 year old as well, and just needed a new seat recently too. What you want is a "combination" seat, not a convertible seat. This will allow you to use the 5 point harness for some years still before you make the leap to a seatbelt adjuster type booster seat (the combination seat has both options). There were only three that received the top safety ratings (I can't seem to dig up the link, sorry) and of those three, the Evenflo Maestro was recalled. I'm sure Evenflo put a fix on the recalled ones because they are back in the stores, but I still wasn't comfortable buying one, even though the price was MUCH lower than Britax ($70 vs. $250 or so). I bit the bullet and bought the Britax. I love it, and my son loves it, and I try not to think about the price. lol. I know he's safe, and he'll have this a few more years. Good luck!