IMO it comes down to:
Ty Lee - taking Katara and all those elite earthbending soldiers, it should be obvious why she is here
Zuko - as we have seen several times, his skills with his blades is very impressive
Iroh - many years of experience, though his age probably hampers him at this point
Azula - I'm surprised no one has mentioned her yet, in the very first episode of book 2 they demonstrated that she is more than just a bender, she effortlessly defeated Zuko using no bending at all, only preparing her lightning attack to finish him off. I know Zuko has grown a lot since the begining of the season but I'm still not sure where he stands compared to his sister, I think she may still have a good advantage over him.
Edited on 10/11/2006 3:16pm