My son is two years old and I got him this one:

Graco Argos 70 3-in-1 Car Seat - Crest - Graco - Babies "R" Us

It is a 3 in 1 and converts as they grow. Its from 20-120 lbs so you wont need to buy another car seat for a long time.

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2002 3.0i (DOB: 5/2002)
Mods:
A few...