Bard is the Easiest DPS to play. It also comes with some benefits to your party/raid, that are much better in 8 man content than in all the 4 man content you have to do to get there.

Blm / Smn are great choices, you're ranged so you can take it a bit easier with evading and targeting. Blm has strong burst, Smn's DOT damage is AMAZING

Mnk / Lnc both are very strong DPS but as a melee you probably won't have 100% up time, or 100% in "sweet spot". Both bring a lot to mid and late game, and even End game although they take more coordination to execute well.