It all comes down to personal preference but your cheapest and most customizable option would be just to make a list and order the bulbs individually and get exactly the colors/style for what you like. The kits are obviously predetermined by whoever put them together but don't really give you any flexibility to personalize the game (and typically cost more).

Non ghosting bulbs are typically used in inserts to prevent the ghosting effects that can happen. You wouldn't really need them for GI lighting.

This is probably a great way to start. If you want to use colors in the inserts or different brightness/colors/styles in the game you could always order a few of each you are thinking about and just see how they look.

When I LEDed my first game I ordered a few of the different whites for the GI and ended up liking cool white the best and now I just use that for all my games in the GI but alot of it just boils down to what you like and want the game to look like. Lights are easy to swap so you can experiment and change pretty easily if you want to see what different options look like.

Also +1 for Comet.

I usually go clear dome, color matched on the inserts on my games as well, but I think it all just boils down to experimenting and personal preference. OP, mess with some and see what you like!

I color match usually with the exception of yellow as they never tend to look as bright as I want (personal taste) with clear domes. It is a bit more expensive to use the colored bulbs but I prefer the look.