I understand your paranoia, teddytales66; I don't want scratches on my phone's screen, either. I do use screen protectors and just think it is common sense to do so, but many others don't. It is, of course, up to you. (On the other hand, if you are one of the lucky ones who can afford to upgrade your phone every 4-6months, a screen protector might not be considered a necessity.)
I don't know if it is the BEST screen protector but I have been using those made by Clarivue for the past few years. They are easy to install (really!) and do their job admirably. They are more expensive than many of the cheap ones out there, but I think they are worth it. (No affiliation, just a happy customer.)
I have one on order for my new HTV Evo V 4G; I tried to keep the factory screen protector on until I got the one from Clarivue, but one of the corners came up and that was that. Hope my Clarivue protector gets here soon!
HTC EVO 3D Screen Protector from Clarivue