Get new countertops (granite or one of many other upscale options) in a more neutral color and paint the oak. Add updated hardware, if you haven't already. Many buyers like white cabinets now. Sand the cabinets, wash them with TSP, prime, then paint. We did some of our cabinet in cement gray, which is popular now, too. If you are going to rip out any cabinets, take out only some of the uppers (which are the ones with the cathedral tops) and put in open shelving. I haven't had anyone even notice my cathedral cabinets since I painted them and updated everything around them, though, so removal shouldn't be necessary. If the kitchen can handle darker colors, the easiest option is to paint the cabinets with a thin layer of high-gloss chocolate or mahogany paint. Do a light sanding (don't remove all of the finish) and paint the cabinets with one thin layer of paint (not stain--regular opaque paint), following the grain of the wood with your paint brush. Do only one coat. Some of the grain will be visible through the paint and it will transform it into an antique, rich-looking wood. The upshot is that you need to alter both the cabinets and the countertops, though it needn't be a huge ordeal. If you leave a dated kitchen in an otherwise-updated house, you'll not only get a lower price, but a lot of buyers will be turned off altogether and it will take you longer to sell.