Trade up if it's less than they expect: there's so much talent in the top 6 that you really cannot go wrong with any of the picks. If a QB comes off the board in front of ATL, there's no need to move.
Trade down if it's a really good offer. Picking up a few trash picks isn't meaningful, but an extra 2nd or so would be helpful. If last year taught us anything, its that you can get a good player in the early 20s.
For the love of everything, don't say "we have to have this guy." If you cannot win without the one guy you have to have, you aren't diverse enough to survive. Which is why I think this will be comrade's last year here. ATL becomes far too focused on some players, which is why they overdraft after round 2, and it's killing them. That said, I'm happy to be wrong about this when ATL drafts well (enough) and they're back in the NFCCG this year.