I tried out the suggested Mesmer build and had great success. It took about 4 matches before I suffered my first death. 1v1 I was near unstoppable, and only was stopped by an Elementalist who was very smart about neutralizing my Phantasms.
Sword/Pistol + Staff is allegedly the way to go, and I will try that with this build this weekend, but honestly I love the aesthetics of the Greatsword over the Staff.
I also have found Blink to be an invaluable ability for closing gaps with a runner or, more importantly, to escape a bad situation. The Signet of Domination (Stun) is really good as well, so I replaced Mirror Image (2 Clone Summon) with this one. I kept Decoy (Invis + Clone Summon) because its saved my butt, and I use it in conjunction with Blink to get out of trouble. I am less than impressed with Elite skills, but instead of the suggest Mass Invisibility I'm sticking with the Time Warp.
I should also note that its really awesome to be able to play with different PvP builds, change your weapons, enchantments, skill loadout, ect...whenever you want and with no costs. It really allows you to play with your build hassle-free.