AFAIK, DDR3's standard voltage is 1.5, RAM at 1.65 has been factory overclocked to reach the speed its at.
In the price range, the V6 GT is certainly still viable.
Other options would be the Thermaltake Frio or Corsair H50, though you will pay more without much more performance.
If you want top of the line air grab a Noctua NH-D14, still $50 cheaper than the V10, but $30 more than the V6.
Cooler Master V6GT Review - Page 5/6 | techPowerUp
Haven't heard of any major issues with the Sabertooth, have a link to what you were reading?
Please read through the thread thoroughly before responding.
Nobody wants to read a wall of text, formatting is your friend.
i5 3570k | 8GB G.Skill 1600MHz | R9 290 | SeaSonic 750X