How can anyone except you know what "just in case " means in your case. I really don't know how the opinions of even all 45,000 APUGers in this type of question can actually help you decide.
Originally Posted by Shootar401
Only you can make the decision based on the facts as they apply to you and your feelings. If I give an informative answer to your question which gives you information that you don't already know can you tell me how to find happiness as it applies to me of course and not you?
On the other hand if you want to know the pros and cons of primes v zooms and under what circumstances you might need an ultra wide angle then OK but everything you have said suggests that you know most of the information