I strap two kids in and out of car seats a million times a day or so it seems. We are really looking forward to the day that Cole is in a booster, but since he is almost the only 5 year old we know that has not hit 40 pounds we continue to use the five point harness. Cole has two Safety First 3 in 1 chairs that work fine, but are a little tricky to hook. We used the Britax Roundabout with both the kids and loved it. Lots of padding for comfort and it also has great safety ratings which of course is what we are all looking for as parents. There is a wonderful deal today on Target where you can score this seat for only $99 with free shipping. The cover is very feminine, so you could always buy a cover.
Check out the Britax Roundabout for $99 shipped!