It's all about the money

Face it folks quality work is 80% wrapped up in the material investment. If you choose to do it yourself there is absolutely no need to shortchange yourself on this most controllable aspect of home improvement. If you choose to hire it done, once again do not shortchange yourself. Ask for an estimate based on labor alone do a little leg (keyboard) work to get the most satisfactory materials for your site. If you leave it up to the contractor odds are he will maximise his profits ahead of the interests of your project.