Eric....I had very little to do with my Camera Store the last 5 years and retired 2 1/2 years ago.  I had a manager that took care of it.  So I am 8 years away from it really, and in Camera years that is like a century anywhere else except computers of course. I ran the Studio, which was where the money was.  We used Canon after we went  Digital in 2003, but used  Nikon in 35mm when we were still analog, but almost totally we used medium format.  

Mos has it very right, except, I am a full frame chip guy and do not like APS-c chips ...but It is far better in the last ten years, since megapixel counts are higher, but I still am a Full frame guy. The Nikon line calls the full frame chip cameras FX.  I think they start at 1699 tho.  It is the D850.  The line of APS-C  start at 649.00 for the D3500 they are CCD chips.

Many folks have a  APS-c camera and don't know it or realize it or even care.  The chip is smaller and traditional lenses will snap on but they are not meant for them.  Basically, A full size chip utilizes basically a 35mm size sensor to capture the image, which basically measures the sensor from corner to corner at 50mm.....hence the old days a normal lens, meant to yield the magnification of our eyes, was 50mm.  Anything greater was telephoto, and less than 50 was wide angle.  A "C" chip has a normal of 30 to 35mm.  Not that it would matter but all lenses have aberrations (inherent issues)...and subsequent corrections to compensate.  Wide angle lens have some pretty radical correction incorporated into them to stop the "fish eye'" effect and Long lenses use an opposite correction to focus all the light spectrum.  So while the lenses interchange from APS chips to full frame, there are some strange results form using the wrong series of lenses.  Your lenses are APS-c so you would need to stick with a D-500 @$1600 , D7500@ $1000, D5600@700, D3500@$649.  For those of you Canon users this is commensurate to the  Canon "R" line, formerly called the Rebel line.

The 7500 looks to be a nice camera, 21. meg, 4k video, and an ISO range to the moon and back.....in other words you can shoot in almost no light.  Also, do to the way sales are set up you may r may not be money ahead to buy a body and lens set over just a body.  

One thing I do not like is mirrorless bodies....I am sure we will all be there someday, but I think they are weird.....it is like watching a little tiny tv in the viewfinder....look through one.

A few  last things,  when Camera companies change models, they sell there entire stock of whats left to one retailer or two...like Sams or Best Buy.  These are what is referred to as distressed stock.  They also may or MAY NOT be a better deal...you will need to do some research.  There is really only one issue to buying one of these, according to Federal Trade Commission rules  they have to maintain repairs for 7 years past that time......some companies (I don't think Nikon is one) will sell it's entire repair parts stock to another repair house, whom they may or may not tell you who that is.
Also, the model numbers on the website is ALL they make and distribute in the US.  There are some dealers in NY particularly that have some models with unfamiliar model numbers.....probably never used in the US ever....These are models possible from Europe or Asia.  Most of these DO NO have US warranties and need to be shipped to the country of origin to be repaired.  This is called Gray market....ie:  Pentax of America is not a worldwide Pentax it is an entity of its own in the US that sells there cameras and has exclusive rights here but will not repair another countries product.  Canon and Nikon are subsidiaries of the world wide Corp and have vasilated on repairing other countries cameras.  Gray marketing is limited now somewhat but was a huge problem in the early 2000's, but is still alive.

Feel free to contact me....





Mike