[carpeperdiem]

If you use webmaster mode, you'd discover that "Price" is a language variable.

{$lng.lbl_price}

You'd also learn that the template that you want to edit for the detailed product page is skin1/customer/main/product.tpl

You'd also see that "Price:" is displayed as:

{$lng.lbl_price}:

So -- there you have it.

Get to know "webmaster mode" and these types of edits will be very easy.