In terms of potential suitors for Dany,I can't think of many that we have met that would fit the bill;
Jon - Incest ,can't really see it happening.
Jamie - possibly could see this working once Cersei is out of the picture
Littlefinger- doesn't have Sansa and desperate for the throne. Can't see her going for him but I can't see him not going for her.
Not really many candidates at all that would make sense. Jamie probably does though which could be interesting. Path of redemption, alot of political power in Kings landing, unite the houses etc