Before considering which kitchen to fit, get a good, reputable kitchen firm or free-lance fitter to come and measure up. This will give you an idea for a basic layout, based on the size of your room, and your requirements / needs. That'll help you to stay focused when visiting the various showrooms, and ensure that you get the most out of your chosen kitchen supplier and chosen range of units etc.
Ask your questions here, for impartial, free advice to help you make your decisions.