I'm looking into purchasing a macro lens for my D7100. I'd like to take closeups of insects and flowers and have read that the Nikkor 40mm is not good for small objects but fine for larger ones like flowers. I'm thinking an upper budget of around $700. I'd like to have image stabilisation and auto focus. I'm currently using Nikkor zoom lenses (18-55VR and 55-200VR) but would be interested in other compatible brands.
Any suggestions would be very welcome.