Two colors of cabinets is not that uncommon, but people usually like the lighter color on top to keep an airy feel. So it would depend a bit on the color you were hoping to paint the lowers.

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This is about the only example I found. (Not shaker, but I don't think that matters.)

I like the lowers in wood a bit better

new counters/splash/ all new painted lowers... savings? what savings? The drawer base cabinets in painted are the bulk of the cost ......wall cabs are not the heavier share of the cost in renovations.....I'd go back to the spreadsheet and price full replacement .......what cabinets would you pick if all new uppers and lowers....then go to plan B ...paint the existing uppers and get all new lowers [drawers].....in a species w stain [not paint] of your choice [as in Memphis' 2nd pic above] ....I think if you are seeking even small savings that's the better direction. of course get any lighting upgrades so you can pick the correct tones of everything. Another way to phrase the question back to you...... what cost are you incurring to require painted drawer lower cabs to work w older maple wall cabs that you think should be retained ? If you look at your space and get inspired ...what would you pick for a style/finish /configuration if all new cabinets . Bear in mind with efficient storage choices , sometimes the cabinet runs can be configured differently leading to fewer cabinets overall than what you may have now. You can do a dark gunmetal paint or Hale navy paint for the lowers with older light maple wall cabs which I think may be a bit yellowed , if final choice is to keep them anyway.

I need to see your cabinets . Post pics of your space here in a acomment . Do not start another post then you will get actual help not guesses . BTW fake plastic stone for kitchen counters is not an upgrade.