Thanks for all your replies, some food for thought.
I'm decided on the barbarian as it's one class I've never played before in any of the other games (BG1/BG2/IWD1). I've played paladins to death. Unless there's a cool pally-only weapon in the game?
So as it stands now the party is:
Barbarian - main tank, pack mule
Cleric - healer, secondary tank
Sorceror - offensive artillery, diplomat, party spokesperson
Wizard - secondary spellcaster, alchemist/loremaster
Ranger/Rogue - detrapper, lockpicker, scout
Pure fighter - main tank, pack mule
Magness,
Cleric will probably take Tempus as domain.
General party alignment - I've not thought about it, does it matter? I tend to have parties leaning towards the good side, but I intend to have an evil character or two in my party.
As for my ranger/rogue, what I really want is for just enough skills to be able to open locks and detrap; so I'm thinking a rouge 1/ranger x combo, just to get the skill points at 1st rogue level, then concentrate on the ranger.
What do you think?