Will a zoom lens that cover a greater range be to much of a trade-off in the aperture department..?
My logic (and knowledge) tells me that it will make more sense to go with more lenses, which means better quality glass, greater aperture range, faster focus and and.
Personally, I find that having a larger aperture lens is more valuable than covering then entire focal length range with zooms. For example, I love the Sigma 17-50 mm f/2.8 paired with the Nikon 70-300 mm (which is not a large aperture lens, but at this focal length large apertures are way too expensive). You can always add a few primes (e.g., 85 mm for portraits) later.
The Sigma 17-50 mm is excellent on Canon too (compared to the Canon equivalent, taking price into account) and IIRC there are a few options around 70-300, or 55-250, etc.
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