I would do it in your format. Neal is one of the best goal scorers in the game. He also offers better peripherals. And, despite the fact you probably won't keep Zajac, he'll help you this year. I feel he's gonna have a solid bounce back year.
If you can get the 2nd rounder as well, then it's icing on the cake.
20 Team $$ Dynasty League (23 man roster, 17 man minor roster) w/Salary Cap at $75M on Fantrax
G, A, P, +/-, PP, SHP, Hits, Blocks, Wins, Save%, SV, GAA
C - Getzlaf, Pavelski, Eakin, J.Mitchell
LW - Datsyuk, Marchand, Ott, R.Bourque, Higgins
RW - Perry, Little, Franzen, Vrbata
D - Chara, Seabrook, Giordano, Seidenberg, Visnovsky, Gunnarsson, Gryba
G - M.Smith, C.Anderson
Minors - Etem, Mark Stone, Spooner, Pirri, Jankowski, Matthias, Zuccarello, Wiercioch, Leopold, Ceci, Labarbera, Visentin, C.Johnson