Frame- The OP appears to be in Roseville CA. As far as I can tell the frame issue pops up with guys dealing with road salt. The OP might be dealing with an occasional trip to Tahoe etc, but that's about it.
Motor- I drove several 07- 09's and 10-11's before I bought my 07. Honestly, I could not tell a difference in torque, despite the hp difference. Maybe its there, but it is subtle.
Rear end- see my post above.
All that said, I would have loved to have bought a 2010+, but the price difference was just not justified at least for my purposes, and I would rather spend it on mods.
I have driven a Tacoma that has the same engine as the 07-09 fjs and the only place you notice less power is passing on the highway. Other than that, I swear that the 07-09 engine feels faster around town. I would not let that be the deciding factor at all.
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