I am not the OP but I am in a similar situation. Folks recommend "fitting" but I would not have been able to afford my bike had I bought it at the LBS, so it is very nice to get fitting advice online. This is my form on my bike.
http://www.flickr.com/photos/nihonbunka/4086187287/
The seat post is really high so that I am the distance I like from my pedals. Since the seat post is slanted backwards and up so high, my butt, and my knees appear to be behind my cranks. I know that I want to sit further forward because I alwas find myself sitting on the front end of my saddle. I bought a saddle with offset (USE Sumo 40cm with 10mm forward offset) but still my knees are behind my crank I think in the above photo. The distance to my handlebars feels okay as it is but I would like to get an even more forward offset set post and and then a longer stem.
I am aiming for the 30mm offset seat post (which can be reversed safely or not I do not know) but I have had no reply from USE
http://www.use1.com/product/000054/sumo-carbon-/
I think that it may be discontinued, as they said it was two years ago.
Had I bought a larger framed bike I guess this would have been corrected. I bought the M sized which was apparently for my height range. I have unnaurally long legs and a short torsoe it seems. I am glad I did not get fitted though. I would have had to purchase another aluminum frame. The poorly fitting Carbon frame has allowed me to shed 12 pounds and my knees do not hurt, yet.
If anyone knows another LONG forward offsetable seat post then please let me know.