As was already stated, "most complicated" does not neccesarily equal "best".
And I would not say that we are biologically "as good as it gets". There are many areas we could be improved upon. (Stronger immune system, more accurate eyes, Gills? etc)
I will be interested in (and scared of) the human gene experimentation we might see in the future. I believe it will start with simple things, like modifying DNA to create stronger immune systems. It may or may not build up from there. (Blue-skinned fellow with telescopic eyes? It might happen...)