I typically only use three lager strains, and maybe a fourth.
Weihenstephan W34/70, a German lager strain. This is Saflager W34/70, WLP830 and WYeast 2124.
Carlsberg's yeast ("Bottom Number 1"), a neutral and high-attenuating lager strain. This is Danstar Diamond Lager, WLP850 and WYeast 2042. This is the most used lager strain worldwide.
Negra Modelo's yeast, which is sort of in between. This is WLP940, and I hear a dry version might be out soon.
You can also make a case for the Budweiser yeast, which apparently is the origin of Charlie Papazian's house strain (a la 30 years ago). It throws some sour apple, though, so...
Edit: To answer your question, any of the three will work great for an Ofest. I personally like the Modelo strain the best of the three, but for convenience it's hard to beat two packs of 34/70 dry yeast...