The common options would be:

To where the bottom edge of the upper cabinets would be.

To the ceiling.

To line up with some other design elements existing in the kitchen.

[Contemporary Kitchen[(https://www.houzz.com/photos/contemporary-kitchen-ideas-phbr1-bp~t_709~s_2103) by New York Appliances GE Monogram

[Beach Style Kitchen[(https://www.houzz.com/photos/beach-style-kitchen-ideas-phbr1-bp~t_709~s_2110) by St. John's Photographers Becki Peckham

[Contemporary Kitchen[(https://www.houzz.com/photos/contemporary-kitchen-ideas-phbr1-bp~t_709~s_2103) by Portland Photographers Josh Partee : Architectural Photographer

I'm contemplating no uppers..so I think if I do do that, I'll go to the ceiling. But depending on my "splash" type it could be cost prohibitive for me too.
I like the look of the whole space "tiled" though.