Tucker Yard Service Company is contemplating purchasing a new riding lawnmower for its business. One particular model has special features that enhance the cutting and the collecting of the mowed grass, but that mower is quite expensive. Another model is more basic and costs $\$ 1,000$ less. The payback period on the more expensive model is estimated to be 3.5 years and on the less expensive model, 2.5 years. The "bumper-to-bumper" warranties are two years and one year, respectively. From these limited data, what factors should Tucker consider in making this decision?