Which camera makes the most sense?

I am kicking around getting a new dslr camera and would like your input on a question.

The question boils down to whether to go Nikon or Canon.

I consider Nikon the better product but have nothing bad to say about the Canon line. The thing is that Canon is the most commonly purchased product, at least around here, and that means that there are more used lenses available that can be purchased at a reasonable price. So if I go Canon I can get more for my money. In the past I have never had a problem with lenses I have bought used and believe for the most part I will get a good product.

I am a casual photographer but I enjoy taking good photos wherever I go, lots of photos.

In your opinion, what makes more sense, buy the more expensive Nikon I would prefer and afford a smaller assortment of lenses or go with the less expensive Canon that will also give me more bang for my buck in the used lens department?