5200 & 5300 are base models with less features. Only lenses with built in focus motors will AF with them. The older (& less expensive) AF lenses won't AF on those models. It is true that prices have come down on the D7100 since a newer model has been released...The difference between the D7100 & D7200 aren't exactly minor, but it really depends on what you shoot as to whether or not it makes sense to get it...
topcat wrote:
Look at the D7100. A great camera, and noew that the 7200 is out, great deals. The upgrades on the 7200 are relatively minor and of no concern to me. You can also look to the 5200 or 5300, and save even more.