What is the best sprocket combo, i do alot of trail riding but also alot of wide open stretches where i'd like to have as much top end as possible?

 

That's the rub...you can't have both. [img]i/expressions/face-icon-small-wink.gif[/img]
My experience with the stock combo is it's generally ok for most but with tight and techinical trails it's too high. I went with 1 tooth smaller in the front and have been happy with it. Lost some top end but not enough that I care. I would also add that I normally ride trails and don't need the top end. With that sprocket on the front I can really lug thru the tight stuff.
I want to say stock is 16 on a 2005 DS, I've got a 15 and you can also buy a 14.