I currently own a single DSLR camera that I have purchased in 2010 - Canon Rebel T2i. It was my first DSLR camera and it still has a kit lens - 18-55mm. The camera served me well and I've had lots of fun with it.
Now comes the difficult decision. This month (March 2013) Nikon is planning to release the new Nikon D7100. It's available on Amazon for $1196 (Body only). In addition to the body, the 35mm lens will cost me an extra $200. I was drooling over Nikon D7000, shortly after I have purchased Canon Rebel T2i, but it was slightly out of my budget at a time. If this was still 2010 I would definitely buy Nikon D7100 without hesitating.
But over the years I realized that lens is what matters most. I just got an notification from B&H Photo Video about the upcoming Sigma 30mm f/1.4 DC HSM Lens for Canon DSLR. It's an updated version of the discontinued Sigma 30mm lens. The starting price is $499.
So it comes down to buying a new camera vs keeping the old camera + buying a new lens for the old camera: $1396 vs $499. Yes I could afford either option, but I want to make sure that it's the most optimal choice.