Hi folks.

I am heading to Glacier shortly and would love some advice from the folks that have been, specifically which lenses I should take. I will be using a 60d and plan to take the following gear:

Sigma 10-20mm f4-5.6
Canon 24-105mm f4 IS
Canon 70-200mm f2.8 IS II
Canon 50mm f1.4 (for low light/night sky)

I will also have a sturdy tripod.

My question is in regards to gaining a bit more reach for wildlife. I don't think I saw anything above 105mm in Bryan's gallery. Will I be ok with 200mm on the crop body? Should I consider renting an extender (1.4x or 2x), or the 400mm prime? I'll be on the go with my kids in the park so I'm not really looking to pack or set up anything longer/heavier than the 400mm f5.6.

Thanks in advance.