Did I get a good deal on my truck?

I just bought a 2007 Chevy Classic Silverado 1500 HD. It is a crew cab - 4x4, has a 6.5' bed, rhino bed-liner and tow package. One owner (a retired guy who seemed to take good care of it). 10 ply 35" tires with 5000 miles/6 months on them. The transmission was just replaced under warranty 2000 miles ago, and the warranty (power train) is still good till November. It has normal wear and tear scratches but nothing major - Cosmetically I would give it a B+ - I ran a Car Fax report that matched everything the seller told me. ( The report came up good). Asking price was $18,250, and I ended up paying $17,250. I've been keeping an eye out for a good deal for about 6 months now and I feel I made a good decision and got a good deal but was wondering some opinions? Was this a good deal or just average? NADA showed clean trade in was $18,875 with retail showing $22,475. Thanks