Do what you think is best.
I have a German Shepherd that's a purebred and, yes, I paid for her and, no, I don't regret one cent or one second I've spent with her. When she passes on we'll be freaking devastated. It's mine and my daughter's first dog and the thought of her passing sucks. In advance, I'm not trying to insinuate I'd love the dog any less if she was adopted, just that, I don't regret buying her, not one bit.
My cat is a shelter cat, and we really lucked out with him. He's the biggest mush of a cat I've ever met.