These are probably the top picks with the parameters you specified;
Sigma Zoom Telephoto 70-300mm f/4-5.6 $219.00
http://tinyurl.com/rhf3fTokina Zoom Telephoto 60-300mm f/4-5.6 $179.95
http://tinyurl.com/memzyTokina Zoom Wide Angle-Telephoto AF 24-200mm f/3.5-5.6 AT-X $299.95
http://tinyurl.com/l9cpaNikon/Nikkor lenses are usually better than others, but they dropped the ball on their 70-300. No point in paying for the name for that lens when you can get as good for less.
Tokina has been surprising people a lot the past few years. Their 12-24 is actually better than Nikon's 12-24 and 1/3 the price. I have their 12-24 and love it.
As mini mentioned, with the longer lenses you'll probably want to look into a decent tripod, else you'll have to shoot at fairly fast shutter speeds to keep from blurring the image.
It's probably been mentioned in another thread, but definitely check out the
Fred Miranda forum. There is a lot of good info there and the people are generally helpful.