Most of this is personal taste. BUT - IMO wood worktops look great at first, but always a bit ropey a few years down the line - especially around the sink. White Corian will stain really badly. Some kind of granite or composite quartz would be my choice. - Built-in, raised cookers are much more practical if you have young kids around the place. Also nice not having to bend down to get stuff in and out. And because you have a separate hob/oven, cheaper to replace if something goes wrong.