Alright, I actually have save files on every decision, not at the start of each Chapter. So if you want I'll give you a file, at the point where you meet Iorveth at the elven ruins, to confront Letho. It is almost at the end of the chapter, and I believe almost every side quest is done. Also it is on Dark difficulty so you get the Dark armor set from Act I as a bonus.
Do you have dropbox by any chance?