Which lens is a very personal decision. The 100-400mm is good - but for an "L" it isn't great. An excellent lens is the 300mm f/4 L IS - no zoom but with wildlife your lenses never seem to be long enough anyway!
You can use the 1.4x teleconverter with the 300mm with very good results. Teleconverters don't work as well on zoom lenses.
If you can find a source, I strongly recommend renting a lens for a week or more to see if it fills your needs. A Canon "L" series lens holds its value very well - if you need to switch to something else you can always sell for 85-90% of your purchase price. Not so with the alternative brands.
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