You have the Safety 1st Complete Air and it will rear face to 40lbs, I hope you are using it rear facing and using it to its full potential.... otherwise you are kind of wasting a good seat if you have your 1yr old forward facing in that seat. And they aren't 'air flow' pads, the yare air protect pads that are for side impact protection in a car crash.
Please, if you are using this seat forward facing for a 1yr old, google EXTENDED REAR FACING and JOELS JOURNEY for more information on why your child should be rear facing still!
As for a lower priced seat in a second car, the Britax Roundabout 50 will rear face to 35lbs, forward face to50lbs, and is $160 at Target, its an excellent seat, easy to install, and will last a long time for your child.
The Britax Frontier suggested below is not appropriate for your child, the child mus be at least 2yrs old, 23lbs to use that seat because its forward facing only and thats the requirements on that seat.
A few others are First years trueFit, Evenflo Triumph Advance (will work best in a smaller car).