Of course, if you don't create an addition to the house, and just remove or relocate a wall(s), you then have infringed upon a contiguous space and decreased its size, so you have to weigh which option is the best for you. Is it worth giving up the other space to increase the size of the kitchen? In my experience, if you can do without the adjoining space, it is much better to devote that extra space to the kitchen.
You should also consider what size and shape the room will be from a vertical standpoint as well. If it is possible to increase the height of the room by raising, eliminating or altering an existing low ceiling or soffit, you should seriously consider taking advantage of this option. The additional height will provide more cabinet storage from the increased height of wall cabinets and the room will become more voluminous which is always more visually impressive and comfortable. From a construction standpoint, the load-bearing issues will apply to increasing the room height just as it applies to moving or eliminating walls.
Examples: Do you often make spaghetti and pasta, which requires filling a large pot with about four to six quarts of water? If so, you should have a pot-filler over the cook top or range top. Since there are only two of you and it takes a long time to fill up the dishwasher before you can wash the dishes, you should consider a two drawer dishwasher which enables you to wash one drawer at a time, thereby saving energy and providing you with clean dishes more often. Do you prefer an air switch in the countertop for the disposal or do you want the switch to be on the backsplash? Do you want a garbage disposal in the prep sink as well as the main sink? Do you want soft close on your cabinet drawers? Do you like the idea of pendant lighting above the island? Do you want a filtered water system? The questions go on and on!
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