The two most popular are the Sankey and Walter editions, both of which take liberties with bowing and octave displacement. You can take them and tweak them by examining a more "urtext" edition: http://imslp.org/wiki/Arpeggione_Son...bert,_Franz%29
There's also this edition with a great series of articles discussing the idea of a bass edition in general, discussing the two mentioned above and introducing a new edition which I haven't seen. http://www.discordia-music.com/Arpeg...troduction.htm
Both the Sankey and Walter use scordatura. If you want to play it in orchestral tuning, Liben and Douglas Mapp have piano transcriptions to G minor. I've also heard a bassist play it in A minor in orchestra tuning. I think the Discordia edition is in orchestra tuning.