Hi Matthew,
I second the idea of skimming through the beautiful rabbit hole of Pinterest to get ideas and brainstorm. And focus more on your Kitchen, Bathroom, Flooring and Paint (inside and out) for better bang for your buck on your ROI.
As an Interior Designer, I've been working with realtors remotely to help update properties prior to listing. For most projects, we tend to go with an elevated warm neutral color palette that feels contemporary, fresh and approachable for most buyers. Of course, some areas have a little more room for play.
Warm white walls, like Benjamin Moore White Dove feels modern and clean with a slight putty undertone. Or Swiss Coffee (any brand), which is also warm. Eggshell finish.
Trims and Doors in a clean white, like Simply White, in Satin Finish.
Ceilings in Simply White, Eggshell Finish.
If you'd like to paint your Kitchen Cabinets, since they're in pretty good shape, a nice greige (grey beige) or dark taupe is nice. You could think about painting the uppers in a warm white or light beige, just a skootch darker than the walls. Or paint the perimeter cabinets in a warm white and accent the island in another darker color for a contrast that feels like it's a piece of furniture.
Black Door Lever Hardware and Plumbing Hardware, Cabinet Hardware, Accents and Light Fixtures are a nice pop that feels modern and cohesive. Black is also more affordable than the gold, but if you're budgeted for Gold, it does give a great warmth to a Kitchen and Bath, and can be paired with the black you have going on.
I agree about leaving one bath for resale, unless the tub is in another bathroom? When you replace the wall tile and shower fixtures - Larger scale tiles (24x48) should be more affordable on labor, less grout and easy to clean. Smaller scale tiles (subway, 4x4 or decorative 12x12) add texture, dimension and excitement.
Lastly, a PSA about lighting. Please make sure all the bulb temperatures throughout the house are the same so that it feels inviting and cohesive from room to room. It's a subtle annoyance that may be subconscious to most people. This goes for Recessed Cans, Sconces, Pendants, Chandeliers, Lamps, Outdoor Lights, etc. If you can install Dimmer Switches, even better. Select warm white bulbs or LED cans (preferably 2700k to max max max 3,000k. Anything higher is a harsh, uncomfortable blue light that feels like high noon to our brain).
If you need anything, feel free to reach out. I'm happy to help!