<Also, the P60 can't in now way produce anything close to the bass and rich, deep sounds that you hear in this song. Are there any digital pianos that do?>
No digital produces the full, deep tone that a decent acoustic upright or grand can develop! But this is a very hot topic here and the pro digital league will tell you exactly the opposite.
<If the pedel is to be held down, what does the symbol on sheet music look like?>
The pedal is not necessarily noted in every issue of a piece. If it is it looks like a P under the bass line. If you're supposed to release it's marked with a *.