Claymore
3x3 Eyes
I think the main thing here is that too much change will cause a riot. I'd probably pick one of the latter ones if I were setting up a new site, but here, we can't change too much.
And here is the main crux of our situation. This is what is constantly leading this into a circular argument, and why it doesn't feel like we're making any progress. I think we need to implement Flint's suggestion if we're to ever break out of this stalemate. Pose the questions to the community, see just how many users are for or against an upgrade, and more importantly, get specific feedback on these options. If we do change, then how much of a change are people willing to accept? What aspects must be preserved (i.e I can see that the Thanks hack gets mentioned a lot here), and what do we not mind losing? Or if we don't go for an upgrade, then what can we do to improve the current set up as it is? What plugins do we need and what can be done to improve overall interaction and readability?
All of us peaking into this thread can individually pick what we like or don't like, but we ultimately need to get some vast feedback from everyone if this change (if it is indeed a change) is going to happen.