My 96 stang is in dire need of a tune-up.

From looking at it, it looks like it still has the original plugs and wires. I am going to use performance wires but no idea as to what plugs would be the best.
Is there a true difference in plugs? if so, which one do you guys recommend?
I used to always go with the best priced ones but that was before I had a nice car. Any suggestions would be appriciated. If there is any other advice for the tune, please share..