Re: if u where an Akatsuki...........
Who would pick Kakuzu when it even says in his description that he regularly kills his partners? And he fought the first Hokage and survived. I really wouldn't wanna tussle with him, I'd severely doubt my chances of getting out alive.
As for Hidan, too creepy, and he'd probably kill me just for giggles.
I'd go Deidara or Sasori, they're both equal for me. Sasori's the least likely to kill you but if he walks around in his Hiruko puppet all day I'd get a little pissed off at him after a while. As for Deidara, he's more likely to flip out and kill you than Hidan or Kakuzu but I still reckon he'd do it. Also, if he loses his temper at an opponent and kills himself I'd die to, he was willing to kill Tobi to beat Sasuke.
So all in all, I'd have to choose Sasori.