I agree with jawjaw but would add a couple opinions:
At least get the GI OCD board so the Shields work properly. There are also multiple inserts, not just the shields that benefit from a flex head bulb. I don't remember them all off the top of my head but the Jackpot arrow at the center scoop is one, I tried a lot of different regular bulbs including the faceted ones but because of the position of the socket on the board it's hard to find an LED that lights that insert really well. I almost always use Comet or Titan bulbs so get a sample pack plus some flex heads, then use the list of the number of #555 and 44/47 sockets that Pinguy compiled in one of the other threads on this subject to make sure you know how many of each you'll eventually need.