Can you help me find a perfect european cruise?

Me and my boyfriend want to go on a cruise this fall, but we are having trouble finding ones that hit all the spots we want to go to. We basically want to hit the good spots in italy and greece. We want to go to Rome, Naples, Palermo or Messina (Sicily), Venice, and Athens. Also, Alexandria (Egypt) if possible. We have looked through the major cruise lines, but there always seem to be some stops like Turkey, Croatia that we aren't really interested in at this point. Also, we want to keep the price kind of around what carnival/norwegian/celebrity charges. Please help!! :)