Time to buy a the Nikon D7100 you had been considering. Or switch to Canon. Or to buy a new-generation Nikon D5xxx series, which has that sweet flippy screen.
If you want the best optics, you will not get them in 7- to 10- ounce lenses. If you want a camera to "leverage" your skill as a self-described casual photographer, take my former photo/video salesman advice to heart: the people that benefit THE MOST from mid- and high-end cameras and lenses, are beginners, and intermediates. For the casual/beginner/intermediate shooter, the camera with the BEST AF system, and the BEST sensor, and the BEST lens will make his or her shots come out markedly better than when trapped with their f/3.5 18mm and the f/5.6 max aperture end of a 55mm lens, which REALLY is a short telephoto.
The more experienced and proficent the shooter, the more they can work around beginner-class gear. It has been enjoyable helping you, but I would say, time to make a decision on weight, price, and model. Go to a store, or order by mail. But realize the fact that, as a casual shooter, your ***equipment*** plays a big role in what you can, or can not, shoot.
