Definetly this will be your best bang for the buck since you already have the kit lens - It just means you have to be inconvenienced by the lens changes that's all
Last, if I grab a Sigma 70-300mm, I will also be buying a Canon 50mm f1.8 Mark II lens as well to cover that lowlight range.
APO means apochromatic - to minimize CA: http://www.sigmaphoto.com/lenses/lenses.asp
Well, I apologize for my confusion.
The Sigma 70-300mm lens is the best bang lens?
The Canon 50mm f1.8 lens is the best bang lens
or the Combo?
The Tokina 24-200mm, great build quality, sharp results... by itself is the best bang lens?
I need to take wildlife shots, some low light conditions, sports in a gymnasium, walk around lens, good daylight AF, some wide angle if it could to it... (currently using the kit lens, and it's ok, but no impressed with the softness of the images, and I unsharp them and it helps)