in my party i have

Samul Gorison (Invoker) me
Viconia love intrest
Hear Dalis
Aerie
Jan Jansen
Valygar

What do you think

Good party except that you only have 1 fighter, who is valgar. Personhally I like magic characters a lot more than fighters but it also helps too have them. You might want to get korgan (an evil guy) in the copper cornet but if you doing ok then you should just keep you party now. Just play around and see which NPC's you like.

Not sure why you have Aerie and Haer'Dalis at all. Drop them and get Minsc and Korgan, or Korgan and Jaheira.

Yeah..You need one more fighter. Drop Hear Dalis, and get Korgan or Keldorn. Hear Dalis is useless.
I have both Korgan and Keldorn in my team. They are really tanks. I can almost finish half battles by just only senting these two tanks.