powder ink? its called toner. agree with the above, no absorption, paper is paper when it comes to laser printers, with the exception of the super cheap or recycled crap. Just use mediumly good paper and you will be fine. Also, the printer puts the same amount of toner on every page, it does not change the amount of toner it uses depending on what paper you put in it.
The guy at staples should continue to only sell staples...