Having finished the game, I just wanted to post my Party and PC build, and add some comments. I had great difficulty settling on a Primary Character (PC). Partially due to the Might attribute being a desired attribute across all classes. Traditionally I've always built a wizard/mage class, but to start with, this class is SUPER weak. So I started playing other classes. Tried a Ranger, a Cipher, a Priest and finally a Chanter. I got quite away through the first Act with a Ranger with a bear, but I always came back to the feeling that I was missing out on a lot of conversation options, due to low Perception, Intelligence and Resolve. In the end, I decided I'd break the rules, and build a PC that had no might. This way, I could invest in high Intelligence, Perception and Resolve. No, this still didn't give me ALL the conversation options I wanted, but it certainly gave me most of them. Of course I had to choose carefully which class I believed would be LEAST affected by lack of might. A melee toon was of course not an option. As were Wizards, Ciphers, Druids and possibly Rangers. Rangers don't DO an awful lot of damage anyway, but still. In the end, I settled on a Chanter. But this Chanter was ranged. With a Arquebus. Which made up for *some* of the lack of might due to it's raw damage output. (I was annoyed to find that Might affects the rifle and pistol - as if the damage output of these guns reflected how hard you pulled the trigger or something!) The Chanter can still Chant, (and I'm don't *think* the Chants were affected by might - I could be wrong here). And the Chanter could still summon very useful allies - again supposedly without the use of Might. To make my Chanter more useful, I made her the Mechanic, so she was the one finding all the traps and loot etc.
I finished the game, including beating the Master Below, with her, Eder, Aloth, Durance, Pallegina and another custom Wizard. Although I regularly swapped the custom Wizard for a Cipher - either Grieving Mother, or a custom Cipher (because GM stat's were pretty poor), because I thought the Cipher was a really interesting class. Using the boots of stealth on my Chanter with the gun, with the Cipher casting the 'Flanked' skill, gave some decent damage results for my Chanter with a lack of Might.