I'm commenting in part because your layout is so similar to ours.
A 6 foot window would be lovely for the light.
But I wouldn't trade a 5 ft window for the larger 6 foot window
if it meant I had only an 18 inch wide wall cabinet over the dishwasher area.
In my experience, this is the cabinet where you will store your everyday glasses and dishes.
Do you have another storage plan for your everyday dishes? If so, then perhaps the 18 inch cabinet it OK.

Of the two elevations, I like the balance of the double door 27 inch cabinets flanking the window better.

That said, I'm not in love with 27 inch wall cabinets.
In general, I prefer wider cabinets and think they are more functional.
Is there any way to rework the wall cabinets for a 30 or even 32" cabinet?

I'm not trying to be bossy. But just for reference and for the process of the conversation, here is our similar wall elevation:

Other things to consider, how does the width of each individual window in the three window set relate in size to the width of the doors of your wall cabinets? Do you want the window to be the drama? Or, so you want the cabinets to dominate? Either look could be fine.

A discrete thing perhaps, but when the window gets wider, its grid pattern changes from even squares or slightly vertical to horizontal. The drawing of the wall of cabinets looks funny to me, with the grids in the cabinets vertical and the ones in the windows horizontal. If the 5 foot window became taller, the grids would become more in tune to the cabinet grids.

My inner safety marshal wants to speak up. In either one, using the cabinet to the right for dish storage is kinda problematic - you can't reach a lot of the cabinet next to the fridge from the left side of the dishwasher; its door and/or the refrigerator would be in your face (literally) if you stood to the right of the dishwasher.

As the door size of the cabinet increases, the door would stick out PAST the counter top by 5-6 inches and would need to stop at 90 degrees because of the refrigerator. I'd be afraid that eventually I'd run my face into the glass door as it stood open.

Lavendar_lass- I like the balance of the five foot window too... And because I'm living with awful '90s oak cabs (that I had nothing to do with picking!!!) it didn't occur to me that the white itself will brighten things. Hmmmm.

Thank you so much for the help.

Re window height- that was my immediate thought too and I agree with you. But both my GC and the window guy told me that a higher window would look funny with the outside elevations, as it will be set higher than the other first floor windows at the back of the house. What do you think?

PS - have a happy 4th!

Because all of those windows are almost always different than every other window in the living areas.

I would go both down and up - start the window 3-6" down from where the drawings show and go 3-6" taller. Perhaps consider going down to counter height? I've seen people run their counter top out a little deeper and use it as the window's sill.

I had crank out casement windows over my sink in my pre renovation kitchen. You can't beat the casement windows for ease of use. But we decided to match the double hung windows we have in the rest of our house when we redid the kitchen. They are not as easy to open. But I do think they are a good choice for the style of our house. We have a big bank of three windows on the "breakfast nook" side of the kitchen that let in lots of light. So I was less concerned about maximizing the windows on the sink wall. But if I had had a bit more room, I would have loved to have put in a triple bank of windows as you are planning.

Dan1888- I have about a foot between the current window and ceiling so I'm hoping that will give me at least some play?