I really want to buy the Canon 24 -105 f4 L for an upcoming trip.

My current lens selection:
Sigma 10-24mm
Canon 70-200mm f4 L
Canon 50mm f1.8

My plan is to sell the 70-200 (which is hard as it is a mint lens) and buy the 24 - 105. Do you think this makes sense? Should I look at selling the 50mm as well as it will be covered with the new lens? Any other lens suggestions for travel photography maybe?

Cheers.