At 2x tackle per sack, there's not much value on the defensive line. In leagues like this, I'd try to find as many studs at LB and DB as possible and look for consistency in tackles on the line. You won't lose much ground to a team who has three inconsistent double digit sack guys giving up only 2 points at a time. So, despite starting three guys, I think you can reasonably cut Bert Berry. Dewayne White is a good flyer as he may be a better tackler than he looks. But I don't know that you need three guys like Carter, Geathers, and White. None are a sure bet for double digit sacks. I might shop one or two of them to see if you can upgrade this position or another. Smith and Warren are good depth in this kind of scoring system.
I like Kamerion Wimbley a lot, but I can't see him having big value in this scoring system. I'd bet Shawne Merriman wasn't as valuable as you'd expect in this tackle heavy system. As for the rest, as I think I've recommended to you before, you need to decide what you want to do with your team. Eric Barton and David Thornton are starting quality players, but they aren't getting you any closer to a title. If you don't see yourself contending this year, move them while they still have value. You've got Pierce and Henderson (although EJ may fall into the Barton/Thornton category, too) to anchor your starting lineup and at least two of the Anderson, Brooks, Cooper, Gaither quartet will earn decent starting positions during camp.
I don't know what to tell you about Pacman. He's probably impossible to cut given the return yards premium but could be an albatross on your roster. The same philosophy applies here as with the LBs. Dawkins might be trade bait or an anchor. It may be worth waiting on Pollard or time to look for a surer upgrade.
I can't imagine those sixth round picks are worth much in a 16 team league. Guys like Pollard and Hodge almost certainly have to have more upside than the flyer you'll take there.
If it's me, I'm shopping (then cutting) Bert Berry, Robert Geathers, Eric Barton, Kamerion Wimbley, Cedric Griffin and one other DL of your choice (or Pacman). You'll have plenty of shots at DL later and I'd want to watch what happens with your potential LB and DB options come camp.
More importantly, you're at a crossroads now. Your first step, before making any moves, has to be to decide what direction you want your 2007 team to take.
If you're trying to win now, it's time to sell on the potential of some of your youth to get some stud upgrades. Right now, you have three very studly defensive players (Pierce, Hope, Dawkins). If selling some future value (IDPs, draft picks, etc) nets you two more stud linebackers, regardless of age, I'd do it and make your run. Adding a Keith Bulluck or London Fletcher from a guy who wants to rebuild makes your defense a huge relative favorite. If you're going in this direction, none of your youth is untouchable, but I'd keep a player or two behind as a hedge for future trades or if your plan fails.
If you think you're a year away, then you hold the Hodges, Pollards, etc and move the Thorntons and Bartons while they still have any value. There's no upside with those guys in a rebuilding effort other than their trade value (unless you're in a league that holds a playoff to determine draft position).
In a perfect world, you could slowly build yourself into a winner without dealing off the top or bottom of your deck but that's impossible in any kind of competitive deep 16 team league. Choose a year (or longer window) to compete and try to fill a lineup with studs, hope for health and make a run. Writing off a season before it starts isn't much fun, but running the table a couple years down the road will be. 7-6 teams filled with nice depth and a few solid players don't win titles.