I'd go with something like this
chardev 9
You need pretty much all the resilience you can get as arcane. Many people think that full pve gear with int gems is bis for mages, this is not true. Mages are really squishy in the end, especially as arcane when you lose your 8k absorb. As I said, try to get as much resilience as possible, if you're planning to go arcane. You are going to need it. Your 4 stacked blasts with arcane power on should still hit 5k+ on resilience targets.
About talents. I find Arcane Concentration and Arcane Potency trash. More RNG to RNG, arcane does not rely on crits like frost. Besides there are better ways to spend your points. If you wish you can move 1 point from Focus Magic to Incarter's Absorbion, but I'd keep focus magic because it offers extra dispel protection and 3% crit chance is always nice for your partner, and to you. Incarter's Aborsbion exists mainly for the knockback effect anyway.
If you're planning to go arena I'd suggest playing with either dpriest or rogue. As arcane setupping burst is even more important as frost. You might find yourself playing defensive for a long time before you manage set up your burst, but if you do it properly something is bound to die. If you're a type who just likes to play crazy offensive, arcane is not for you.
For BGs you can just pick full pve gear with int gems and stay behind.
Anyway, with 5.0 patch coming live in less than a week I'd suggest you to wait. Arcane is getting revamped and will become entirely different spec from what it is now.