I have done alot of those different quests from Vex and the other guy that is done in Windhelm. As I read somewhere, I needed to do five of them to get the special quest. Now I have done 20 for Windhelm and still no special quest. I had done 5 quests for Solitude at the same time I had 5 done for Windhelm, and got the special quest for Solitude. Any ideas?