Hey OP, DIY Kitchens do lots of different standard blues - do you mean the kitchen style you want only has Cobham Blue as an option? Sorry for stupid question 🤦🏻♀️😅 Are there no similar kitchens that have a nicer blue that you prefer? When I looked on DIY Kitchens I found that there were quite a lot that were similar but with quite different colour options.
I don't particularly like grey, and I've never been a fan of the recent trend for grey interior decor. So my initial thought was instantly to say Cobham Blue. Then I looked to see what shade it was and it's a very dark blue - almost navy? I know you said the room is a decent size, but are you happy with dark units? The grey you chose was quite a light colour so it's quite the difference.
If it's being trendy that you're worried about, navy and dark blue kitchens are very much on trend too. So it's likely that grey and dark blue will go out of fashion equally quickly... Personally I'm not really bothered what the latest trends are, I like what I like. I would say don't worry about trends, if you love the colour just get it and stuff what the trends are!
If you prefer the lighter units, do they have a cashmere/taupe type colour or a sage green? I really like cornflower blue/lighter blues but if they didn't have that, a soft green would be my next choice. Does that appeal?
If you're going for the Cobham blue, have you looked to see how it goes with your light worktops and pale walls? Will be quite a striking contrast - not that it's a bad thing, just that not everyone likes that strong, two-tone effect. The other thing is that with such a dark colour it might be trickier to paint over in the future (as you suggested) - although you could just get replacement doors to freshen things up when you're ready for a change.
Picture yourself in the Heron Grey kitchen and then the Cobalt Blue kitchen - really picture it....which one makes you feel happier? Or neither?