I went with Comet 2SMD cool white to match the brightness and tone in the rest of my line up (modern machines). You could get away with daylight white as well, and use 1SMD bulbs, but for me, that really stood out as different from the rest of my games.
For the flashers, I'm using the flashers that came in the Comet TZ LED kit (don't remember what they were off hand)