While Nova's Graco 4ever Car Seat was quite expensive, it's been well worth the investment! That's the way I look at it. The way that most car seats are designed, you have to end up buying 4 or so seats when your child is little, including booster seats.
There are a lot of pieces to it when the kid is little, but as they get bigger, parts get adjusted and even come off. It really is working out quite well now that Nova's gotten bigger and it's the only seat she should need until she's ready to sit in a regular seat on her own.
Essentially, it was well worth what I dropped on it.