[villagetinker]

Also include questions about material warranty and installation warranty. Do you have pets or considering pets, be sure to ask about the resistance to claw marks. Finally make sure to discuss water resistance, while there have been lots of improvements some products may have a wood core that does not like water.
As for installation, you did not mention the existing floor, I am assuming carpet. When this is removed there will be dust, old glue and small pieces of concrete that all need to be removed, the best way is vacuum and damp mop. If the decision if for a wood plank product pay attention to the underlayment, failure to use underlayment can lead to a floor that makes noise whenever you walk on it. If you go with tile you MUST have a crack suppressant layer installed. This gets glued to the concrete, and provides a suitable surface for the thinset and the tile to be applied.
I have personally done both types of projects. Send me a PM if you would like to discuss further over the phone.