The whole spark plug thing has been beaten to death on these boards. However, since I'm bored, I'll go over it one more time.
Motorcraft AWSF-34PP - Ford has been replacing this with a single platinum design. Not sure if the double plats are still available, but the new type are only single platinum and will not give you the life you would expect from a double platinum plug.
Autolite APP-2544 - This is a standard replacement double platinum plug. This plug will give OE performance and if that is what you are looking for there is no reason to try anything else.
NGK TR55-1IX - OE replacement plug with Iridium pucks instead of platinum. Will last as long as a platinum with better performance under high boost.
Platinum is not added to the plug for performance reasons. It is there to increase the life of the plug only. Platinum does not wear away like normal metal contacts do. On the other hand, Iridium has the potential to fire under more pressure than platinum while retaining it's long life characteristics. If you do not want to change your plugs often then the use of a platinum or iridium plug will get you 60K+ mile change intervals.
If you don't mind changing plugs more often (I prefer to pull plugs yearly to see how things are going in the cylinders) then you can use a standard plug.
Here are some performance options for engines that are running at higher than stock boost levels. All of the plugs in this catagory have reduced tip length for better detonation resistance.
Autolite APP-764 - this is a standard heat range, double platinum plug that does not extend so far into the chamber.
Autolite 764 - same as above only a non-platinum plug and an excellent choice for high boost motors that are regularly maintained. Gap at .045
Autolite 103 - this is another non-platinum plug that is also a cooler heat range than stock. It is highly recommended for boost levels in excess of 17psi or for nitrous applications. Gap at .045.
Denso Iridium IT-20 - this is another high performance low profile plug. They arguably may offer some performance improvement over a standard plug in some situations. However, at 10X the price of standard plugs the cost effectiveness of these plugs is debatable.
Other brands can be used by cross referencing these part numbers, there really isn't any magic in any plug as long as you understand the basics of what is going on with the main types of plugs you can use.