Anael--don't worry one bit about your BBs "matching"! The point of these blocks are for them to help us remember our time "on the trail"....they will be a fun sampler quilt.
QE--I will just have to wait and see what my Janome dealer gets in. She is having a sale on her 7700s, that makes them only a couple hundred more than a used one, so we'll see if they are still on sale when I have enough money saved for the bigger machine....it really might be a better idea in the long run to go bigger. What kind of table did you get with your machine?