I would suggest that you go with any Britax seat! Those are hands down the BEST seats on the market. I have 6 of them... I would suggest a Britax Boulevard for your younger child, it can go rear facing and then you can turn it around when you need to. I would NOT move a 2 year old into a booster, either get another Boulevard or a Regent. I still have my 5 year old in a 5 point harness! It doesn't bother him AT ALL as he and his little brother were in a horrid rollover accident going 80mph on an interstate, both secured in Britax Boulevards, both walked away LITERALLY without a scratch. Those 2 Boulevards had to go, so I replaced them with 1 Boulevard for my younger son and a Britax Regent for my older son. The Boulevard will probably last to about 5 years old, and the Regent will probably take my older son to 7 or 8 years old. Good luck!