I had STR 15. I used items to boost to 20 for Drakescale. I only put 1 point into STR, the rest were boosts from the Fade. DEX 35 for the dodging talent. Every other point goes into cunning.
As far as the party go, I'm nearing the end of a nightmare run with Alistair, Wynne and Morrigan. It's been very easy with cone of cold and mana clash with me. --- I can then the close quarter beats them.
The Dodge skill is not good IMO. The evade action resets your swing action. You can get your STR up to 12, then add 4 from the Fade Bonus. That would be 16 STR total. If you have "The Stone Prisoner", you can get Harvest Festival Ring, which gives you 2 STR, and you can get The Key To The City early on too, giving 2 STR also. That should be enough.
If you're gonna be a momentum dagger rogue, I think you can get by with just the 2nd or 3rd DW weapon mastery (26/32 dex, I am not sure). You might want mre dex for attack rating.
Mages trump all classes in this game. Dog can never be better than Morrigan. His overwhelm is good, but not extraordinary. Morrigan has like, a dozen ways to take someone out of the fight.
But the game isnn't hard enough to warrant needing to ultra powergame. This isn't Wizardy 8. Play with who you want.
Also, follow the poster's advice about using items for str. Dex is prolly better. --- "The Children of Bodom song is part of the EU tracks, they're from Finland." "Finland isn't in Europe, it's in Valhalla." -RB board Wisdom-