I'm using a cheap 50mm f1.8 with a $10 reverse adaptor, good for macro on a budget but not as versatile/flexible and takes a bit of practice/experimenting to get good results as its full manual control.
Have heard the Nikon 105mm is fantastic but expensive, Tamron 60mm and 90mm and Tokina have good reputation at a lower price, Nikon 85mm good too. Nikon 40mm and 60mm good optics but working distance probably too short to get many insects without spooking them.
They'll all give about the same maximum magnification (1:1 ie a ~25mm long object will fill the frame on a D7200), but the shorter focal length lenses have to get closer to the subject to do it.
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