A shadowpriest is probably the second best class for 1on1 PvP after the rogue.
Fear, shield combined with mindblasts, DoTs and mindflays let you churn out immense DPS, when you are fully shadow speeced. Being undead is big plus (probably the only case, where a racial "really" matters), as you will get a extra DoT with Devouring Plague. Extra DoT = More DPS.
Shadow damage gear is also wildly available (e.g. the felcloth set, which any decent tailor should be able to provide). Also it is really important to stack up on stamina (more so than even int or sprit), to avoid being one hitted by warriors or dagger rogues.
There are some things you should note however: though a shadowpriest is indeed a very strong PvP char, you will run into difficulties when fighting healing classes. As healing is more mana efficient than damage, you will run out of mana pretty fast, and a shadowpriest oom is a dead shadowpriest.
You have also to note that the shadow priest lacks any kind of AE damage. This the big difference to a mage (on the other hand a shadowpriest is much more sturdy than a mage). The lack of AE makes him a less effective in zerg situations like e.g. Alterac Valley.
So if you are looking for a great 1on1 PvP char that is not a rogue, the shadowpriest is the way to go. I had immense fun PvPing in the plaguelands when Melisandre was still shadow specced.
As talents go: invest the first five points into Mindtap, as it will reduce downtimes significantly while leveling, then go right up to Mindflay. Generally I would suggest investing all points into the shadow tree until you get shadowform, and then continue from there like you prefer.
I would have specced a little diffentley then Mongo, but as speccs go, it basically is matter of personal preference ;)
Fear, shield combined with mindblasts, DoTs and mindflays let you churn out immense DPS, when you are fully shadow speeced. Being undead is big plus (probably the only case, where a racial "really" matters), as you will get a extra DoT with Devouring Plague. Extra DoT = More DPS.
Shadow damage gear is also wildly available (e.g. the felcloth set, which any decent tailor should be able to provide). Also it is really important to stack up on stamina (more so than even int or sprit), to avoid being one hitted by warriors or dagger rogues.
There are some things you should note however: though a shadowpriest is indeed a very strong PvP char, you will run into difficulties when fighting healing classes. As healing is more mana efficient than damage, you will run out of mana pretty fast, and a shadowpriest oom is a dead shadowpriest.
You have also to note that the shadow priest lacks any kind of AE damage. This the big difference to a mage (on the other hand a shadowpriest is much more sturdy than a mage). The lack of AE makes him a less effective in zerg situations like e.g. Alterac Valley.
So if you are looking for a great 1on1 PvP char that is not a rogue, the shadowpriest is the way to go. I had immense fun PvPing in the plaguelands when Melisandre was still shadow specced.
As talents go: invest the first five points into Mindtap, as it will reduce downtimes significantly while leveling, then go right up to Mindflay. Generally I would suggest investing all points into the shadow tree until you get shadowform, and then continue from there like you prefer.
I would have specced a little diffentley then Mongo, but as speccs go, it basically is matter of personal preference ;)