I need a complete template (very professional looking) package (as complete as possible) for a website.

I'm willing to pay for it. However, it has to be as complete as possible and look very good.

What sites do you recommend for this?

Thank you.

http://www.templatemonster.com is pretty good. See if you can go through an affiliate - they get a discount, which they either keep themselves, or <sometimes> are nice enough to just give you the discount.