Venables is a decent DC option but I don't think he's coming to Dallas. I know Venables from his days at KState and OU. The problem I have with Venables is that I kinda think he's a College Coach and not necessarily an NFL Coach. Some Coaches are like that. Some are made to be in the College Ranks and some in the Pros.
I think you have to look at this thing from the stand point of what you want out of your Defense. Do you want to be a team that wins games with your Defense or are you looking to be a team that scores points and asks it's defense to just come in and make stops at critical times in games? Two very different styles, very different mindsets. I tend to think that we are the later. So what you want in that situation is a Coach who can dial up plays at critical times and get impact, not necessarily guys who want to build a defense that just flat shuts you down. I'd probably look at a guy like Jim Schwartz. He knows the division, he's a guy who knows how to scheme pressure as well as anybody in the league and he's available. As I said earlier, I like Pittsburgh's Keith Butler and Iike Baltimore's Don Martindale. Both are DCs already and they would be tough gets, it's likely that Jerry would have to sweeten the deal by offering the Assistant HC title or something of that nature but if you look at either of these guys, what you see is consistency in the product they provide. Look at the last five years or so of Defensive rankings and you will find each of their teams in the top 5 every year. Those guys understand how to run a Defense and make them work. If you want to look at a College Coach, then Ash, to me is a better fit for the Pro Game. He's one of the top DCs in College Football and I had a chance to watch him work the Defense at Texas this season. They were flat terrible at the first of the year and towards the end of the season, I'd say the Defense carried the the team in maybe the last 5 games. He did a hell of a job in just a single year there with players that were not his guys. That's a good job of coaching, to me.
So those are they guys I might look at if it were up to me.