Yes, but...
Word of Caution:
Many community-based themes are coded sloppily, which completely negates the efforts Drupal has made to make their CMS secure. Worse still, common practice in theme development is to find a theme like the one you want and customize it. Since code of these themes is shared so freely, a single sloppy mistake can affect many other themes derived from it.
If you go with Drupal (or any other stock CMS), don't just hire some joe-shmo designer to theme it for you. If possible, hire one contract for the visual theme and a php developer to actually build the theme from PSD's
