I just wrote about 2000 words on the upcoming free agent defensive line class but the SBN editor and/or the internet ate that shit, so now I'm just going to give you a list. Imagine a whole bunch of really insightful analysis with stats and age and upside and predictions and Seahawks' fit and aweseomeness next to each of these guys' names, and imagine how much smarter you'd be after reading all that. Keep imagining, because I am not going to re-write it.
I separated out the DT/DE class by types.
The "Young, talented, super-expensive, probably" guys:
The "Interesting if the price is lowish" group of guys:
The "Good but underrated and thus cheaper" style guys:
Sammie Lee Hill
Ricky Jean Francois
The "Pete Carroll/John Schneider/Tom Cable Connection factor" guys
The "I'm old and I want to get a ring" guys:
The 2nd chance new team new system guys:
The "hahahaha just kidding" group:
Conclusion: Keep your peepers on Sammie Lee Hill & Desmond Bryant in major free agency, then Richard Seymour & Dwight Freeney in secondary free agency. Watch out for Mike Patterson, Fili Moala, and Sedrick Ellis as possible Carroll-connection guys, Ricky Jean-Francois is a Scot McCloughan-connection guy, and Cullen Jenkins as a John Schneider-connection guy.
Sorry this isn't very useful. Stupid internet.