This years first and next years second feels about right. This would be roughly pick 10 this year plus pick 35 or so next year.
I actually think he's worth a bit more than that, but as we all know, when a player out of contract nominates another club they lose a lot of leverage at the trade table.
Melbourne are in need of some midfield link up and speed so if there is another player that suits this (from Adelaide or a 3-way trade), then I'm certain we would up the ante.