Just remember with wood (and even laminate), there are other costs such as prior floor removal (tile being the most expensive to demo) and the price for all the quarter round moldings (to hide the edge gaps) and transition pieces.
Per sft it seems comparable to tile/stone but once you add up all the stuff... tile/stone ends up a better deal (and easier to maintain depending on the material you choose).
As for NY Carpet, from what they told me, they are so much cheaper on a lot of their carpets because they are seconds (leftovers, returns etc)... same quality but they can't honor the manufacturer's warranty. I don't think I know anyone who has had to use that warranty, they either steam clean it or change it... so I always wonder if that 10/15/30 year StainMaster warranty really means anything other than a marketing tool.