Thinking of switching to Arcane.

To the arcane mages out there, I have a few questions. (note that I don't raid I just do 5 mans for now)

What kind of numbers do you pull on average on trash?
bosses?
AoE?
Single target?

What would my primary stat be? As in, what should I be reforging my gear to?

And most importantly, is it fun? Do you actually have a good time playing it or do you just go through the motions?
I was arcane for quite some time. According to most people right now, arcane is not that powerful in raid due to the amount of movement required during boss fights. In terms of fun, it is your own opinion, some people like it and some dont. The rotation is not very complicated, in my opinion, easier than fire because there is less dot/crit debuff you have to watch out for. In terms of damage, AOE for arcane is pretty bad, for single target/boss, it depends a lot on the fight. If it is fight like BH where you dont have to move a lot, arcane still pulls great number. But in fight where there is a lot of movement, i would imagine the damage to be a bit less than fire who can almost cast everything while moving.
I'm sure the 'leets will tell you how they are all doing 20k damage in heroics. :) But not all of us are 'leets ...

I'm a pretty crummy player with pretty crummy gear. Overall in a heroics I do anywhere from 10-12 K overall. I'm higher on bosses but lower on trash. However, with better gear/skill I'm sure the numbers would be considerably higher.
Arcane is a lot stronger with the recent hotfix. I've been very impressed at its damage and its consistent dps. I'm running Arcane in place of Frost now for many fights that are not AoE heavy. Even fights with tons of mobility like Al'akir, I was able to hold my own and top meters in the end. I'm not even geared for Arcane and it's producing some very nice numbers. Here's the state of DPS for my guild's Mages, you can check out the ranked parses to get at least some idea of its potential.

http://search.stateofdps.com/?name=&guild=mediocre%20at%20best&server=stormscale&class=Mage
To be honest, I still use Arcane for 5 mans. I raid in Fire, but for the lack of mass AOE in 5 mans, Arc is where it's at.

And Gillyy, it's no joke. 18-20k is perfectly normal in 5 mans with the Luck of the Draw x3 buff, and in burn phases 30k comes quick.

By the way, everyone would tell me I play Arcane incorrectly, but I say my DPS says I'm doing fine.

Basically AB forever in 5 mans, nothing will survive your whole mana pool to make you go oom. That's why it's amazing for 5 mans. Sadly I can't do that in raids, so it's back to Fire I go.

About your AOE damage question, I never AOE, ever. Just target your tanks Focus and blast away.

I'm sure all stats will vary, but I'm over soft haste cap for Fire, and I reforge to crit with Arcane. I approve of Arcane.

Reminder to everyone, I'm only talking about 5 man dungeons here.

ToAnd Gillyy, it's no joke. 18-20k is perfectly normal in 5 mans with the Luck of the Draw x3 buff, and in burn phases 30k comes quick.

Oh, I have no doubt you can get 20k in five mans. I can't, because of crappy gear/skills. I'm also not ready for PUGs yet (don't want to get booted for NOT doing 20K) and, as such, don't get the Drawx3 buff.

But I'm sure 20K would be easy enough with decent gear and the x3 buff.