I think led strips inside the cabinets would look good. I would buy 1 or 2 and muck around with positioning them until you know what looks good and how many you'll need.


Edit: I see you dont have the shelving yet. I would worry about the lights after the shelving but consider the power (mains or outlets or battery leds?) options, flexibility of installation (can the lighting be changed to suit as the display may change), and how to hide them during shelf construction.