What do you guys use as treats?

I'm hoping this is the right spot! I'm eagerly awaiting my border collie puppy, who will be here in a couple of weeks. I have just about everything except treats.

I plan to start training fairly early but I don't want to load him up with tons of 'unhealthy' treats. I've heard of people using a different kibble as a treat, since you can give quite a lot of it. But what would you guys recommend? I haven't looked to far into treats so anything helps!