Had a lovely evening playing on the Ikea kitchen planner and have left DH slightly terrified by the cost of kitchen fittings before installation! I thought I'd done well to get any change from 6k when it included U shaped worktop, 2 sinks, under cabinet lighting, big dining table and chairs, gas hob, double oven, extractor fan, microwave, fridge freezer and built in dishwasher, oh, and some cupboards 
Obviously if we used our own current appliances and just left space under the worktop for them it would bring the price down - they're not that old, but are there any advantages to built in appliances other than the aesthetics?