Replacing our kitchen sink

My wife has never liked the kitchen sink in this house.  It is badly scratched up and because of that condition, it is difficult to clean.  She asked me to help her find a reasonably priced undermount stainless steel sink to buy to replace it.  Well, I was resisting the project; I thought that replacing the sink would be a big ordeal, and a huge expense.  But the prices of sinks at the mrdirectint.com have made me reconsider the project; we may very well replace that sink after all!