Although magnetic racks have their benefits, they scratch knives.
That's why you've gotta grab a couple Rare Earth Magnets, a nice board of your favorite wood, and then make your own bar. Drill pockets into the back of the board (using a forstner bit, or whatever you have handy), put in the magnets, optionally install a metallic cup behind the magnets to amplify the field, and then epoxy in place.
This way you have a wooden board that has magnetic dots along the face, but no metal exposed (the magnets are hiding behind the wood). Looks nice, doesn't scratch the knives, and you can get magnets plenty heavy.
If you've got the right tools, it's a 30 minute project (plus additional time if you want to rout around the edges, or get fancy with the finishes).