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I have always heard good things about Britax car seats although we have never owned one. Amazon currently has two Britax promotions running.
The Britax Ride Free Event on Amazon runs through June 30, 2013. If you purchase a Britax B-Ready Stroller, you will receive a FREE infant seat, second seat (for the stroller), or infant bassinet. The strollers have a list price of $499, but most colors are discounted by $100-125. With the free infant seats having a list price of $179.99, and the bassinet and second seat having a list price of $149.99, this represents a huge savings on the combination.
They are also promoting Shop Amazon Baby - New Booster Seats from Britax. Britax Boosters offer harnessed protection in a booster seat with a shoulder height of 20.5" for children weighing up to 90 lbs and convert to a belt-positioning booster for children up to 120 lbs.