You mentioned that your main subjects are landscape and architecture, for these 2 you will mostly need the wide lens, specially for architecture, and the Tokina 11-16mm will be great for that use.
The lenses you listed are all super zoom lenses and I don't think you'll ever have to use 100mm or more in landscape and architecture photography. The super zoom lenses are mainly used as "one all around lens" that you can take to a trip but it you're not going to shoot birds or something that required the super zoom I don't see the point of buying such lens.
Due to the poor quality of super lenses, you will shoot your main subjects with the Tokina, so the wide range is covered. I think you may want to consider some other lenses with smaller range - a thumb rule will be a max X3 zoom, usually lenses with Maximum focal Length/Minimum focal length < 3 are better in terms of optical quality.
The Tamron SP AF 17-50mm F/2.8 XR Di II LD will complete most of the range you will use but if I can recommend some other lenses I would say you should check out the Canon EF-S 17-85mm f/4-5.6 IS USM. The Canon 17-85 is not the best quality you'll get but it not too expensive and for my opinion completes your range better.
If you're looking for higher quality you can check out the Canon EF 24-105mm f/4L IS USM.
obviously it's much more expensive but it's an "L" lens and you will enjoy it.
Note: Super zoom lens have a smaller aperture at the far end and usually to get sharper image you will want to close the aperture even more. That results in a very slow lens. Moreover the quality of these lenses at the far end is poor.