i recently purchased the D90 and i want i a few good lenses to go with it. im looking at the tokina 80-400mm F/4.5-5.6 AT-x PRO D AUTO FOCUS LENS. $600 on amazon. is that a good lens for the price. im into shooting wildlife. i dont want to spend money on the camera and then go cheap with the lens.....unless i can get away with it.