Play what you believe will be a fun class to play. Nothing worse then getting a toon to 50 then deciding you hate playing it and only made it because someone else said it was a good choice. DPS is all about how well you take care of your toon and how fluent you are with your skills and rotation. Bad rotation = crap dps. Badly modded gear = crap dps.
Every class is completely capable of clearing everything, just depends how well YOU play it to whether YOU will clear it.