Short version: NIGHTBLADE IS AWESOME
At 37 I'm having a pretty good time with Marksman/Nightblade/Inf (pick anything you like for third soul - maybe riftstalker) http://rift.zam.com/en/stc.html?t=0Mfip.x0tRqzAzdo.V0tzM
This is a 36 build that I use - i stopped at 13 NB and started putting more into marksman, but going 14-15 for Dusk Strike and Ebon Fury would work better for melee. This build is -fantastic- in pvp and can hold its own soloing or in instances. Don't forget that you can use swift shot in melee, and barbed shot does a ton of damage on mobs that are closing in. I usually start off with Empowered Shot and barbed shot, then two swifts and rapid fire/deadeye shot. Throwing down a marksman's pedestal, stealthing and using Dark malady, then Strafe is GODLY burst - with just those abilities (not counting my 1500-1700 bulls eye'd deadeye shot) i can pull out around 2400 damage in 6ish seconds. Don't forget Close Quarters Combat.
My personal opinion is that Nightblade is what you're looking for. As your main class. I can kill completely from range without any points in sab, MM or ranger, or bring it in close and dish the pain. Its a very versatile soul - in pvp, i can pop Side Steps or another defensive CD to outlast, or use Scourge of Darkness and anything else i want to bring the burst damage (dark malady, twilight force, flame spike x2, scourge of darkness, dusk to dawn = a very unhappy melee enemy).
NB is great in pvp, too - only rogue soul at this level to have healing reduction (fell blades @ 32 points), let alone a proccing 50%! Awesome mobility as well.
I use http://rift.zam.com/en/stc.html?t=0MipV.VftoMogoos.V0xMho
for my nightblade build. I have terrific mobility, able to kite or close gaps with ease, as well as lots of cooldowns for defense and offense.
What's the today of yesterday's tomorrow?
-Lethial, 24 NS <Wrath of Dagda>
-Liasiannodel, 24 Void Eld <Wrath of Dagda>
a lot more....