My newest character is a Ranger 6 currently, about halfway to level 7. I plan on taking two levels of fighter for the extra feats, but I'm not sure when I should do the split. Ranger 6/Fighter 2 would give me Oversized TWF and Power Attack, with Improved Crit coming in at level 9, basically netting me all of the feats I'll need pretty early on. However that would push back getting GTWF and Tempest II a few levels.

So my question is, what level is a good split choice? Ranger 6, Ranger 11 (for GTWF) or Ranger 12 (for Tempest II)? Or does it really even matter that much?