If you're in the USA, species like White Oak, Maple and White Ash can be great cost-effective options for a real hardwood floor as they are domestic trees and don't have to be imported.

Vintage style. By far the clearest trend in hardwood flooring today is a move towards an authentic “old-world” look. The previous trend for highly polished, flawless floors is over in favor of any, and all, vintage styles that reflect or imitate the traditional techniques and styles of the past.

Prime grade or AB-grade wood flooring is the highest quality of hardwood flooring that you can find. The wood in this grade has been carefully selected, and it features a minimal amount of natural defects like knots, sapwood, and grain irregularities.