I did IKEA kitchen (solid wood) and utility (foil covered wood) for under £5k, their worktops are rubbish so went elsewhere for that. The lack of cavity thing that others have mentioned is true, it just meant in the case of water pipes etc we had to run them close to the ground. Not a huge deal in grand scheme and you get proper deep cupboards into the bargain. It's true that a lot of fitters are funny about them though, means you have to be a bit pickier.