Another point to mention is if you use rift/quarter sawn the movement is minimized but cost is higher. We have been selling the old school solid strip flooring for 37 years (as well as Pine T&G for flooring or ceilings
). Much of it is only 3/8" thick but has proven to be a 60+ yr floor. This is a site sanded/finished floor - something we are partial towards. If you are a DIY'r you would be surprised how inexpensive this floor is but respect the cost of having it done for you once you add up your hours spent.