Amy Dahl's, GanderLandR11's, Tom Wall's, Sharon's, and the other posts makes absolute sense. There are some good Chessie people giving you excellent advice above! I understand and appreciate wanting something a bit different. Just know that if you think you are getting a lab in different clothes you are incorrect and will probably be disappointed. While at times I think we often make too much of the differences, that is not to say that differences don't exist. I'm really referring to differences outside of the physical. There are certainly more qualified people here than me to speak about training methods but saying you want a Chesapeake and a dog that can take all the pressure you can throw at it are desires that could lead to a disappointed owner. As Tom Wall said, train the individual dog. Good advice in that post.
I became a first time Chessie owner 2 years ago and it's been a lot of fun. Good luck with your research!