over the past 18 months my digital camera bag has gone from:
D40 to D40, D3100 to D3100, D7100 to D7100, D800 to D800, 70D to D800, 70D, D810.
Did some horse trading along the way and now have $6000 invested in bodies.

As i changed bodies i scrapped/sold under achieving lenses.
Cutting corners, eating peanut butter sandwiches, buying used and 3rd party lenses i've been able to improve my glass in the past year for only $23,000.
Do i have what i want? no.
But the tools i have are better than i am and that is the way it should be.
Knowing i'm the weak link keeps me trying harder.

In hindsight the best advice i could offer anyone is:
Pick the frame size you really want and stick with it all the way.
And drop a compact in your shirt pocket for those fun/casual shots.

I guess all those good shots using the Nikon 70-300mm vr lens on my D7000 should be thrown away. Oh and those made with the macro 60mm as well, and don't forget about the other ones with the 35mm lens as well. Darn, been wasting my time for a couple of years now.. I have a love hate relationship with talk forums like this.. It seems 80% of the forums talk about why the camera or lens the person or people are using at the time have major faults. Not many actually get out and use the camera and or even consider it's 99% user related when the camera or lens fails.. Heck if you camera doesn't shoot good in totally darkness, then learn to shoot during the day. If you lens is a little soft in the far corners, learn to crop a little from your photo. Working around the limitations of your camera and lens is actually part of the learning process, and most important requires one to actually Use the camera.