Oooh, right up my alley!
(Former certified car seat tech.)
Justthatgirl, most of the infant seats still go to only 20-22lbs, BUT newer seats like the Graco SafeSeat Step1 go to 30lbs! There's also one by Chicco, I believe, that goes up to 30lbs. These are also taller seats, so they accomodate up to 30", I believe - though that's never a firm measurement (go by where the child's head is in relation to the top of the seat).
We have the Britax Companion from DS2. It goes to 22lbs and 30" - and the extra inches meant we could use it until DS was 18 months old!! Yeah, I make 'em skinny!
DS1 had outgrown an Evenflo infant seat at 5 months but only by height and was also not 20lbs before 1 year, so I knew the extra height allowance would really help us, and it sure did! I have pics of DS at about 17-18 months in the SafeSeat, and he had room to grow! Not a ton - not enough to, say, buy the seat at that juncture, but it clearly will fit for a LONG time! I definitely think it's a good investment!
Convertible seats will go to 30-33lbs generally and a few to 35 - so check your manual to be sure!
I have heard the rumours of the upcoming Recaro convertibles and have been VERY interested, but hadn't seen the latest on them! I love the fit of the Young Sport for my DS, but couldn't justify a 40lb harness seat for him (he's in a Marathon now, nearly outgrown it, at 5yrs3mo and 75%ile for height). So I'm really excited to see how these new seats do! The hard part will be finding someone who carries them in stores.
: But thankfully it looks like it's not too much longer to wait!
So, yeah, um, thanks for giving me something fun to do when what I really need to be doing is PACKING!