You may want to stream videos from a NAS that you have on the network or move large files between two PCs on the same network. A 300 or 450 mbps router would let operations like this complete faster but if you aren't intending on doing this you may not want to buy a faster router, I would personally just wait until your internet speed gets faster and just upgrade your router then, but it's your choice depending on what you do with your network.