My pary now is about level 8ish. I was wondering what levels my party members will be towards the end of the game?

Well that is a very open question! First of all it depends on what level of play you are engaged in, i.e., diffucult, hard, insane, or heart of fury. The higher the difficulty of play the more experience points you receive for killing mosters which means in turn that your characters ability to gain levels increases. Second, if you have Heart of Winter installed the game allows the possibility of reaching level 30. Third, levels are affected by class, especially if you are multi-class which means one's experience is divided evenly between the classes which in turn means it is virtually impossible for multi-class characters to reach level 30 unless playing HoF mode. I just got done playing through on the Insane mode. My single class cleric and single class fighters made level 30 -- right near the end of the game. Plus, I had Trials of the Luremaster installed and that gave tons of experience and I still barely made it to 30. My F/T was 19/22; C/I 20/17, and F/M 19/17. I hope this was clear enough and gave you some idea of what is involved.

with the normal difficulty setting and only a 4 player party, i found my single classed fighter night around level 20 by the games end (excluding How or Luremaster). i'd imagine you can reach about level 14 or 15 with a 6 player party? or course, it depends on how often you rest just to kill monsters for exp