Welcome to Powder coating and here is an answer to your ?'s in order
1. Most powders, when mixed will give you a mottled appearance, or salt and pepper look. Take Green and Red for example, you will see spots of green and red, not a combination of the two, I think that would make purple. You would not see purple, maybe some here or there, but not a complete shade of that color.
2. Multiple colors? Yes, but there are limitations to this as well, the powder sticks to the piece via electrostatic charge. So if your part is not completely grounded, or the powder not enough charge, then you will have problems applying two or more coats. But, yes you can do it.
3. The more expensive guns have a higher Kv (electrical power) they can put "into" the powder. It makes for faster more even layer of powder sprayed onto your part. Also, it has features that allow it "easier" to apply powder in difficult areas Faraday cages, two-coats etc...Buy the cheaper gun, and try your hand at it. You may find that that is all you need.
4. The IR lights heat the part on the surface, which cures the powder faster. The ovens heat the part from the metal out. IR lights are like radiant heaters, they heat objects in the room. Ovens are like forced air heat in your home, they heat the air in the room, which heats the part. Ovens are easier to use since you put the part in it, and cure that way. IR lights you have to move around the part to heat all surfaces. Electric ovens work fine.
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