Stick with the laminate...a home should have a good "flow" to it.
Both carpet and tile are odd choices for the stairway considering the rest of the home is laminate. Bathroom and Kitchens are great places for durable tile but unless the rest of the home is tile there is really no need tile anywhere else save the laundry room or mud room. Good luck!
The best person to advise you needs to know three things: your property, your market values and trends, and your personal situation.
Your Realtor will know what the current inventory looks like, and what buyers want. My experience is that real estate trends are very local, and what is "in' in one location may not be "in" at another.
Laminated flooring buyers dont want vs. tile or hardwood flooring.