I use black granite top for my kitchen table top too. It's hard to say whether ur kitchen is exp or not cos it depend on the design, size & material.
I asked my contractor to do a breakdown for all my items eg. cost per ft for kitchen cabinets (cost per ft differs depending on floor cabinet, top cabinet or full-ht cabinet)& cost of granite.
For my length of cabinets, i need 2 large pc of granite slabs (tink it comes in std size per pc, then contractor will cut according to size requirements for cabinet top), cost of my granite is $900. In fact for my left over granite, i asked my contractor to cut & make shelves at my kitchen sink area (for holding cups etc) and bathroom corners (for holding shampoo stuff etc) FOC.
Granite also cost differently depending on the c'tries that they come fr. Those fr India are more exp, but only India ones got those Pearl Blue colour, I only wanted black granite so i took those fr China which is cheaper.
Hope the above will be useful to u! =D