I haven't really got any useful advice but am interested in this as we are about to order flooring for our kitchen/diner. Have decided on LVT for durability and practically reasons. For this room we want stone effect rather than wood effect and this limits the choice a bit. We also need to have click fit rather than adhesive fit and want bevelled edges so it looks like a real tile rather than a totally smooth finish. So, all that considered I think we've decided on quickstep livyn ambient click! Just need to get online and order it now. By the way lots of people rave about Karndean on here, they just didn't do what we were looking for. I'm sure someone will be along soon with more useful advice based on actual experience!
Are you having underfloor heating? Just asking because it affects your flooring choice. Were having UFH in our extension and thinking of having tiles in the kitchen area, but not sure whether to have engineered wood for the other areas. (I'm addicted to the house that 100k built - I think Piers is a genius!)
Whatever flooring you go for I'd highly recommend doing the whole area the same as it'll look larger and flow better plus give you more freedom regarding where one rooms ends and the next starts. Rugs etc can add coziness and define spaces if you like.