M.N.
Both of my boys loved Thomas. They especially enjoyed making bridges and train tracks but they loved seeing how high they could build the bridges. You can get a Michael's coupon off line or in their circular (though I think they're stopping the circulars) for 40% off and the Michael's in Brentwood carries Thomas sets. One Christmas I bought a different item each week and was able to double what I could have afforded otherwise. A battery-powered engine is fun--the boys liked to hook them up to miles of cars and let them go.
Have fun!