When installing countertops, consider the condition of your existing cabinets and if not replacing whether these need replaced too. You may want to give consideration to the idea that counter top materials vary greatly with options that include laminate, solid surface, and natural stone materials.

Articles:
Kitchen Granite Counters for some of the advantages of granite as a counter surface.
Homeowner Remodeling: Contractors, Ideas
Countertop fabrication about fabrication of counters as part of the installed service.
Home Improvement: starting your project & contractors
Kitchen Remodel & Countertops for both cabinets and counters considered together in the kitchen area.