You could use a human
Lorna Crowley or
Liam Greymane as the third worgen one. They're not "worgen" per se, but they're Gilnean and pretty important. Lord Godfrey too, though he might feel a little... out of place.
I'd go for
Nathanos Blightcaller as the third Forsaken one, and/or replace Koltira with Voss.
The rest look like great choices, though the gnomes and trolls are beyond me. You could branch out and use "independent" characters like Millhouse Manastorm or one of the other troll leaders, but eh. Darkspear and Gnomeregan need more characters. >.<
The sin'dorei one is amazing though (loving Rommath in particular). Albeit a shame about Liadrin.