Ahh Campy is great, and the wonderful thing is that you can rebuild the shifters overtime unlike Shimano where you simply throw them away and buy again. With that said, if I were buying a new group I would buy 11 speed. The reason is that I'm sure down the road 10 speed will become harder to get ... that will make things difficult when you need to replace a chain/cassette etc... You can buy other brands of 10 speed chains, but if you are someone that tends to have their bikes for a few years, than 11 speed is the way to go.

IMO there isn't any point to buying something that will become obsolete over the next few years, and make it difficult to keep the bike running with the current group.