Recently I was persuaded by some Second Life friends to take a look at Inworldz. It uses the same Open Source coding as SL to the point where third party viewers such as Firestorm run OK with it, and indeed it looks much like SL did a few years ago. At present it is in Beta so land is much cheaper - $75 monthly for a Region as opposed to $295 and there are other advantages, uploading is free for example. The devs seem to be making some sensible decisions based on SL hindsight - not renting out small land plots themselves for example which should cut down on land blight.
The obvious snag right now is content, but SL merchants and creators are starting to open up stores ready for the official startup next year. Here's an example of what is being done already, sunrise at the Waking Edge, Castle of Lar.