@ Daniel

Hmm, the Tamron does have a really good IQ compared to the Canon 17-40 f/4. Maybe for now, I'll decided to get the Tamron 17-50mm f/2.8 and the Canon 70-200mm f/4. Thanks for you input. Is there any zoom lenses or primes that you'd recommend I get rather than the Canon 70-200mm f/4?