Some of my FA musings...
1) I don't believe in paying for FAs unless they are bargain role players (Durant) or potential game wrecker. Also you get the best bang for your buck on DL/OL compared to other positions.
2) I think Dallas have solid players across the defense, however, they're missing 1 game wrecker. While it's possible to see someone step up next year (Irving, Jones, Smith, Tapper) you can't rely solely on that.
3) The batch of premium players I'd target would be JPP, Chandler Jones, Melvin Ingram, Nick Perry. Teams don't let elite pass rushers go so it's slim these guys hit the market with the exception of Nick Perry. GB front office is notorious of not spending on FAs, even if it's thier own guys. I can see him being available. If so his size, burst and age would be an ideal edge setter and game wrecker for the DL. He would attract double teams which should help the "orphans."
4) T.Crawford needs to be cut. Not that I think he's bad, there's just not enough production to justif his cap hit. Any savings of this cut should help freeing up room for a premier signing.
5) I wouldn't spend significant money on other positions other than bringing in depth. RT is a question though. Free probably needs to go, however, Chaz Green and Emit Cleary can't be relied upon. A replacement for Leary can be found through draft. As with a replacement for Butler and Lucky. Maybe draft one of those pure speed Wrs later on and try to develope.
6) This draft is strong for CB so I can see draft being an option for Mo's replacement. Finally, If Carr doesn't retire I'm good with bringing him back on a bargain deal.