Ok thanks. I have had a second think and I still would like to play Thranduil and Tauriel, but only have a limited amount to spend on new models.
Here is my revised list to include Thranduil and Tauriel. This force has 38 models.
Tranduil on horse
Tauriel
10 Mirkwood Rangers
Damrod
8 Rangers of Gondor
3 Warrios of Minas Tirith shield and spear
Warrior of Minas Tirith with banner
Beregond
6 Knights of Minas Tirith shield
6 Warriors of Minas Tirith shield and spear
I agree on the point in that Beorn is a luxury and I think he might work best in a force with lots of models (maybe minas tirith with cheap heroes and a hero with good standfast). If I was to play Beorn, this maybe the best team? As I feel Saruman counters a lot of the downsides of Beorn. This has 35 models.
Beorn
Saruman the Wise
Damrod
8 Rangers of Gondor spear
4 Warriors of Minas Tirith shield
Beregond
5 Warriors of Minas Tirith shield and spear
7 Warriors of Minas Tirith shield
Denethor
4 Warriors of Minas Tirith shield
2 Warriors of Minas Tirith shield and spear
Might still try the original team but won't take to a tournament on what you have said (thank you), unless it turns out it does work