For occasional walking and malls, I'd suggest an inexpensive stroller. Maclarens are great (although not particularly cheap) in terms of folding and space. For a city they're great b/c you can sling them over your shoulder if you're getting on a bus. However, for the suburbs, I'd be most concerned about comfortable, reclining seat and easy to push. Peg
Perego is supposed to be very good, and ...