Was thinking of specing my priest this way in 3.1,

Holy 14/57/0
Shadow 13/0/58

What do u guys think, something i must change?

Your holy spec should work fine. Only problem I can see is that you don't have Healing Focus, which will make you almost useless in ulduar bosses where raid damage is heavy(too much slow casts/interrupts people will cause you to miss and overheal). I also think Inner Focus is overrated, but It can never harm to have it. Desperate prayer is okay, never had to use it yet though, binding heal usually covers that.

Your shadow spec... no offense =P I think is crap, it combines pvp survivability with the less good pve talents. Improved spirit tap is amazing for keeping your mana, and the 10% spirit increases your damage done(with Twisted Faith talent)definately worth the points. You don't need Shadow Affinity as Shadowform reduces your threat by a huge amount as it is. You only need 4/5 Imp. Mind Blast to fit it in a shadow priest rotation. Shadow reach isn't hugely needed(get glyph of mind flay if you wan't to use it farther away). Improved ShadowForm and Phsycic Horror are majorly pvp talents, the 70% less cast loss is very good ofc, but you can avoid that with a shield if raid damage is a problem(especially as with t8 shielding gives you 250 spell power).

oh so spirit tap work at lvl 80 when u dont get exp? ^^ was thinking it was some stupid lvling talent
I didnt know were to put the last 5-6 points, all looked useless thats why i had some imp shadowform and stuff

I did some research on the mb talent and im not convinced that 5/5 is not better than 4/5, yes 4/5 fits perfectly into the 6sec rotation, but this quote stand out in my mind: "you want the fastest MB cooldown you can because it's the best dps spell we have. Thus, you want to be casting your best dps spell as often as possible."

And if you have a 100ms lag the point will make up for that, ofc spamming your keys will too

new spec, with 2 xtra points Imp VE is a must for ulduar ^^
leftover points in inner focus and 1 in imp shadowform maybe?

Tnx

Well yes, it fits into a 6 sec rotation, which is the best rotation, if you have MBlast .5 secs off CD earlier, then you have to stop mflay .5 seconds earlier or do 1 flay and wait/re-dot/death, and lose alot of damage in the long run.