Q:
Best long range nukers?
As far as long range nukers go, nothing beats a grenade engineer. Huge range and damage, but slow projectiles. It’s not a caster though. I think the mesmer greatsword is a good choice for long range casters, but don’t quote me on that. When it comes to support, guardians are indeed very awesome, but remember that other professions also can support well, but in different ways.
Even though it’s not a caster a grenade Engineer is an exemplar of a long range nuker: 1500 range, easily more than 1k DPS and very spamable AoEs.
However it’s hard to hit moving target from long range but Elementalists and Rangers have the same problem.
That’s the build I’m using in W3:
http://gw2skills.net/editor/?fcAQFAUl0piYH5ShF17IyoCdmoH5XlZZfeMftFEC
Equipment is a mixture of Soldier and Carrion.
I originally used [Protection Injection] instead of [Backpack Regenerator] but it never activated so I switched it with another trait.