I know you can get different spark plugs and some with two or three prong things that the spark goes between, but do they actually make any difference, what are the advantages / disadvantages of the uprated ones? and what actually is the difference?

I am going to be getting some new ones this week for my car, is there any point in getting the more expensive ones or should I just stick with the standard NGK ones?

What would you recommend?

Cheers, Ed