I will be very much amazed if it's faster than 108mbps!!!
So no, in terms of sharing your broadband connection you won't notice any difference. It'll transfer at the speed of your connection.
If you want to share files between PCs though you will definitely notice the difference (it'll be twice as fast)
Personally, I would go for the best I could afford - you don't know what you're going to want to do in the future.