If you're blatantly power-gaming it to try and cope with Weimer's challenges, you might want to swap Rowan and take Valen. Unless Rowan has something really really special going on, she's likely to be decidedly less powerful than the Vamp Princess.
Oh...
I've just visited Chloe's forum, and saw something interesting...
Chloe is not Natural Good as i thought. She is True Natural..
That means that maybe i can allow myself to allow valen in...
And it will also allow me to start the game earlier, because i think Rowan is still pretty far...
Then, i'll have a party of 3 good char (kelsey, imoen, sola), 1 natural (chloe), and 1 evil (valen)...
But still, the druid/clerical role with tanking abilities is up to me...
And as such, i think that the multi Ranger/Cleric is the best.
Any thoughts?