Idiom meaning, usage examples, facts

1. I’d love to have a computer system that is top of the line, but I can’t afford it right now so I’ll have to settle for one that has fewer features.
2. The customer wanted to see every television model that the store had for sale. He wanted to see the lowest-priced standard model, as well as the model that was top of the line

Antonym: bottom of the barrel. Compare to: first-rate. The line refers to a group of similar products or a group of products all manufactured by the same company.