I am a 129 totem necro and honestly i dont recomment, its a good and cool build to play till level 115 but when you start level 120 ubers, a lot of bosses are Impossible due to the lack of single target skill, heres a list of the level 120-125 ubers you cant do:
1- Baal - he will instantly call dozens of minions which we dont have enough damage to kill coz we have 9 totems and 5 Jinns, maybe at level 135+ its possible if you find some amazing sssus so you can kill his minions fast enough.
2- Astroga - he regenerates to maximum life every time, i think that this is impossible even at level 150 since the totems target the statues as well.
3- Viz Jun - theres no good source of defense in this build, so even if you kill them fast, they will always kill you with 3-2 hits, dont waste your time on this uber, maybe at level 135-140 with crazy gear its possible but only if you can kill everything really fast, before they have a chance of hitting you.
4- Xazax - not possible at level 125, maybe later with insane gear, since the totems target the penitents you will deal almost no damage to the boss.
Havent done Nymir Light and Gyuia yet but i think that they may be not impossible with this build.
This is without using respecs, maybe other necro builds can do these so you can respec to other build, do the ubers and them respec back, i am not a fan of respec, i try to do all with the same build.
But its a cool build to play, even if you cant do all the ubers its woth at least play to have fun.
To do all the ubers i recommend a Paladin, any build should do it, its so much better than necro.