We employ the most advanced technologies available including ASP.NET, PHP, AJAX, JAVASCRIPT etc. and we employ them as needed, not just because we can.
Determine the PURPOSE OF THE WEBSITE.
Anything that doesn't serve that purpose should be removed. Your customers are in a hurry and anything that wastes their time will hurt your website performance.
I test all new technologies on my own websites before I suggest that you use them.
Unless the site is about the latest bells and whistles available, or has a definite artistic purpose, simple, clean and very fast is what we recommend.