Plastination. It has substantial plausibility and seems to be objectively testable (eg. http://www.overcomingbias.com/2012/07/brain-prize-fund-near-enough.html ), and seems to be testable relatively soon with very small investments - so it is even more worth researching than it would initially seem because we can become certain quickly and either benefit quickly or move on to other strategies.
Is it wrong/biased to believe we should prioritize extending the longevity of our current bodies over "life extension" projects that can only work with brain emulation/simulation? It strikes me as far more likely to gain public support, or at least gain mainstream approval.
For those who are interested in this topic, I'm just wondering what longevity research today looks most promising to you and why. Whether that's SENS, cryonics, nanotech, brain uploading, etc is fine with me. Any links to actual research papers would also be greatly appreciated. I'm very interested in longevity, and am curious to see if anyone else would like to offer some thoughts on the current state of the art.