I've looked a bit more into the DX lens line, and it's come a long way since the old D40 in 2006.
Went to a photo shop and physically matched the D610 and D5300 and it's REALLY tempting to shed some size/heft and just go with the little one.
The FX series lenses I looked at are not just more expensive, they are HEAVY. I know that they are sturdier, better built, and with better optics, but I gotta be honest with myself regarding likelihood I tote them.
I'd love the best possible IQ, but I won't get any images if I leave the whole rig at home.
With the d5x00 you lose dual control wheels and buttons for changes as it uses menus.
The d7x00 gives you the same controls as the FX bodies.
Also don't just look at modern lenses for everything.
Look at some older AF-D lenses. With the "larger" body (d7x00, d6x0) you get an in-body focus motor that can use these older lenses.
Compare a 50mm/1.8 AF-D to a 50/1.8 AF-D G and you'll be astonished by the size difference with the AF-D being quite smaller. Also 24mm/2.8 AFD, 35/2.8 AFD are great small primes.
I also use a 24-85/2.8-4.0 AF-D lens versus the much bigger & heavier 24-70/2.8. I've also used the small 35-70/2.8 AF-D.
You can get some good small size lenses in AF-D if you research it more and lose alot of that weight and bulk.