I second what Ryan describes as good practices. I am using pretty much the same values.
I am very happy with the "last thing I saw" render with regards to the mix of softness and detail. It was rendered at 0.85 quality and GI 1/3 + SS, narrow cubic AA and AA 8.
However, the important finishing touch was achived in postwork, but carefully balancing out levels, and equally important by applying the glow filter from
paint.net. Awesome filter for vegetation - and it's free.
Regards,
Frank