I mean, 1 Million would be the absolute max I would be willing/we should offer for Brown- A lot depends on how the salary cap ends up looking though I guess.
I may be missing people, or have people out of position, but this is how I see the top 3 available players at each position looking like..
FB: L Mitchell, S Crichton, D Laurie
WG: B To'o, D Tupou, D Young
CT: P
Hiku, W Penisini, S Talakai
FE: D Brown, C Walker, A Douehei
HB: M Moses, S Walker, K Flanagan
PR: N Asofa-Solomona, T Flegler, S Leniu
HK: D Cook, S Luke, J Granville
SR: J Nanai, D Fifita, L Martin
LK: V Radley, T Sims, N Brown
14: K Mann, C Watson, T Peachy
We can probably disregard Second Row, Lock, and Utility all together given our stock there, and there is no chance for us at 90-95% of the remaining players in there.
Ironically, in terms of need and how realistic it is for us to get them,
Hiku is probably at the top of the list
Outside of the people on that list, there isn't a whole lot else going on out there to throw money at, so since you have to spend the money one way or another, and we don't have many guys we need to/should re-sign, if we have the cap space we could try a David Fifita-esque deal, throwing him a shit load on a short term deal just to get him through the door? Mind you, that hasn't worked out so well for the Titans, or David Fifita (except for his wallet of course)
*Note: I don't think a "David Fifita approach" for Brown would be smart at all, just throwing an idea out there.