@catraccoon I play solo more than I play group, and My build for my Arcanist with 60 Talents is very well rounded. If you want multiple end of branch powers, you do have to decide which middle powers you don't max out, but you can do a pretty decent job of building a nice Solo character.
My Arcanist has:
Master Wizard
Power Caster
Unwearing
Unbreakable
and Army Veteran
and +75 Elemental Resistance
+180 Armor
+320 Endurance
+80 Accuracy
+400 Mana
+20 Life Regen
+24 Mana Regen
+24% Damage with Magic Staffs
and +16% Spell Damage
that's in addition to the Ability Score increases along the way. We're only talking Talents here, too, Enchant your Gear and you can get some of these things as well, or increase some you already have.