Spark Plug Wires and Spark Plugs...

I have been looking at some spark plugs and i have found these Iridium Spark Plugs then i found some Nology SilverStone Spark Plugs the price of each plug is about $6 a piece. I know i can go to like auto zone or Kragen or something and get some for like $1.99 a piece haha. Do spark plugs actually make some noticeable difference?

here are the benefits of these spark plugs:

Hotter and more powerful spark
Silver center electrode
Long lasting
Top quality material
Up to 130% more powerful spark
Cleaner combustion
Race proven design
Reliable high-rpm operation
Increased horsepower and torque
Smog Legal
Outperforms all other spark plug in the market

so since it does all that, am i looking at 2-3 hp more in my engine compared to cheap plugs?

Now another thing... the spark plug wires... how wide is good? 8, 8.5?
i dont even know what i have now lol.. i would have to check tomorrow... share your thoughts. thanks