Originally Posted by Thalassa

A common rule of thumb is to invest less in the body and more on the lenses, as bodies tend to get outdated much faster.

In your position, I'd set a bugdet, get the least expensive body of the bunch (they are all ver capable cameras) and the best lenses that would fit in the budget. I.e. I'd say go with the T4i.

As for Tamron lenses (or Sigma or Tokina), they are typically somewhat less expensive than Nikon or Canon lenses, but usually for a reason. They are not bad, but in most cases Canon or Nikon glass is better.

Since you mention sports as one interest, I'd say you might want to get a fast 70-200 mm zoom lens as one of your lenses. If your budget does not stretch to the superb 70-200 mm f2.8 L, consider the slightly slower f4 L lens.

And do get a fast 35 mm or 50 mm prime. They are a joy to shoot with.

Cheers,
T.