Elementalist for conjure element. These skills give around +15 to your damage. Mark of rodgort is also nice for pvp, it sets enemies that take fire damage on fire for a few seconds. Use in conjunction with conjure flame for nice results.
I agree, rangers, when played well, are very good at pvp
correctly is a rather vague term as a ranger built specificly for pve, will probably not fare well in pvp, while it is still a correct build. So I use the term played well