There is probably a compromise between too large for your own needs or too small to attract a buyer and it may depend on whether you live in a city, a smaller town or the country. Given the take-away and restaurant options that proliferate cities, and a generational viewpoint that cooking in an oven is a time-waster, smaller kitchens are in vogue in urban houses and apartments.
Then there is the choice of materials to be used in both new or renovated kitchens. The natural and untreated kitchen components used from early last century to about the mid-eighties is now called retro chic. The materials are better for the environment and may cost more unless you source them from a recycle depot. A quick-fix solution like melamine faced chipboard (MFC) is affordable and effective for cupboards, drawers and doors and could allow you to spend more on bench tops. Once again there is a wide variety of options are available for the working surfaces - laminate, stainless steel, stone or tiles.
It's great to have a brand new kitchen but what if the old wiring can't cope and you need new flooring? These things need to be factored into any remodelling budget. It's surprising how many kitchens have been remodelled but the floor has been left looking like a scruffy child in desperate need of attention.
Then there's bench height. A generation ago builders stuck in benches of a certain height regardless of whether it suited owners or not so if it needs to be reduced in a remodel, the additional cost of wall work needs to be taken into account.
It's better to plan and budget before you start to avoid being slapped with a cost you hadn't even thought of. Newspapers are a good source of information and the internet offers advice from the comfort of home.