I would find a lumber mill/yard that caters to woodworkers, as they will have many species of wood to chose from. Find your local Woodcraft or similar store and ask them. My Woodcraft store even has some wood on hand. Take a sample of the counter and a paint chip with you (and maybe a floor tile) and ask them to help you chose a species that will look good with the counter. They can wet the wood with something (mineral spirits? water?) that will show what it looks like with a clear finish on it. Or they may have samples on display. I did Black Walnut for my bath vanity with Waterlox for a finish. Woodcraft pointed me to a lumber mill, and they glued four planks of heartwood and then rounded the edges to my choice of edge. My contractor did several coats of Waterlox. We wipe drips after use.