Talent specs are purely playstyle. I did the whole "lets see if this guy's talent spec works for me!" thing and it never worked out. I play much better when using my own specs.

And I wouldn't overanalyze the whole talent thing anyways, just roll with it and pick talents along the way. It's cheap to respec.

BUT, it is in my humble opinion that you should do a Discpline priest, so you can get the spirit buff that offers more spell dmg to the locks. Disc priests heal really well too and have lots of mana.