Honesty not much. Sully and our pick or the Dallas pick + a couple 2nd rounders. At this point in Howard's career I'm not sure he's that much better then Amir Johnson.
You guys are massively underrating Dwight right now.
Through most of his prime Dwight was playing 36 minutes per game and was averaging around 18/13 and 2.5 blocks while shooting around 60%.
Right now his Per 36 numbers are 16/13 with 1.7 blocks and he's shooting around 60%.
He's obviously not quite the dominant force he once was, but he's still probably 70% - 80% of the guy he was in his prime, and that's still enough to make him one of the leagues top centers.
Seriously, if you list the top Centers in the NBA you basically have (in no particular order) Deandre Jordan, Demarcus Cousins, Pau Gasol, Andre Drummond, Marc Gasol, Brook Lopez, Al Horford, Tim Duncan, Karl Anthony Towns, Greg Monroe, Dwight Howard.
I'd say Cousins, Drummond and (maybe) Pau Gasol are probably the only guys on that that list that are clearly on a level above Dwight in his current state. Every other guy on the list you could easily argue one way or the other.
That makes Dwight Howard anywhere from top 4 to top 10 among centers, and even a top 10 center is worth a LOT more than Sully, a late first, and a few seconds.
The biggest concern is the player option - that lowers the trade value a lot because of the risk that Dwight walks and doesn't take up the option. That far reduces the willingness to give up core assets (e.g. Crowder, Smart, Bradley, Olynyk, 2016 Brooklyn pick) because if you lose those assets for nothing, it would really hurt the team.
However once you go beyond those core guys every other asset that remains is replaceable, so I'm not honestly all that fussed about taking the gamble.
Even sacrificing future Nets picks is something I would consider if it brings us a a big step closer to being a contender.
The Nets already have Thaddeus Young, Brook Lopez and RHJ - that's not enough to make them a decent team. It is however enough to form a
foundation for a decent team. If the Nets get lucky in free agency and manage to add one or two of the following perimeter players (such as DeMar Derozan, Mike Conley, Nicholas Batum, Bradley Beal, Chandler Parsons, Harrison Barnes, Eric Gordon, Evan Fournier, Jordan Clarkson, Brandon Jennings, Aaron Afflalo) to that existing core, then they could very quickly become a borderline playoff team in the East.
Considering the fact that they have no picks of value, the Nets have every incentive to push to improve their win record, so I would expect them to be HARDCORE aggressive in free agency once Joe Johnson's contract expires, and it's not hard to imaging them picking up at least one of the guys in the list above.
For this reason, I actually feel that trading the 2018 Brooklyn pick ASAP is probably a very good move. I think it's value right now is the highest it's ever going to be, so if you can get somebody of value back then do it, before Brooklyn becomes a fringe playoff team and the pick falls to the #15 - #18 and loses 90% of it's trade value.
I feel the same way about the Boston 2017 pick (which we have rights to swap). Again, I don't think Brooklyn are going to be nearly as bad next year as they are this year, but long as they are sitting bottom 5 in the standings that pick has substantial value...move it while you can.
The only pick that is off limits in my book would be the 2016 pick - that is pretty much completely untouchable until we know where it lands, unless we get a massive offer like Demarcus Cousins, which right now appears to be unlikely.