70-200 f4/L IS USM - light, great image quality and not too expensive, compared to the 2.8
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My suggestion is a secondhand 5DII (if you cannot afford a 5DIII) ... using the 70-200mm f/2.8 on a "crop" camera is like owning a Ferrari just to drive to the corner cafe for a newspaper.
17-40 and 70-200 if would want to travel light. You will have pretty much all focal lengths needed. Don't underestimate the use of a telephoto for landscapes. You can isolate interesting subjects and flatten/compress vistas.