Britax - Parkway Booster Car Seat
Great car seat for kids ready for boosters. Has side wings that stick out so much you feel your kid is safe. Very comfy looking. MOST IMPORTANTLY - this is the ONLY booster carseat I know of that prevents heads from falling down when they are asleep - for the most part. This is mainly due to those wings that they can set their head on. I've read also that it is best to get a booster with a full back - safer for kids in accidents. Not too expensive for a Britax product - should run you about $75 to $100 - try ebay. Comes in many different patterns - very similar to the Monarch model as well.
safe, comfortable, easy to pull in/out.