BGForums

Is there somewhere a complete tech-tree available?
so I can plan better my research?

Due to the way techs link to each other, a tech tree would most likely be a complete un-readable mess
However, each tech description popup does link to the techs it helps unlock within the game, this is probably the best we'll have for now

But this means you just research on good luck...

You can 'look ahead' to a tech you won't and track a list of techs you need before you can get it, but it's not really that straight forward