When remodeling a kitchen or bath one of the primary choices that will effect price and appearance is selecting your countertop material. You should consider a number of factors before making a decision, such as; expected wear-and-tear, do you cook a lot?; maintenance and cleanliness, do you keep your current countertops clean and would you seal a natural stone top on a regular basis; and the cost of labor and materials.
The following links should help you with your choice.
Choose the Best Material for Your Home and the Environment [Green Home Guide]