Gonchar is definitely a significant upgrade over Wiz.
Wiz is on an atrocious ISlanders team.... he may get you a few points sporadically... but I think Gonchar has proven himself to be a more dependable D man.... albeit just as streaky... but his ability to pick it up... especially with an OTT team that is potentially starting to stabilize (more than NY).
I say make the switch! Unless you have access to Petriangelo, Martin or Yandle (who I just picked up after having brutal luck on D too)
5 Teams, Start 4 C, 4 RW, 4 LW, 6 D, 2 Util, 2 G, 5 Bench, 1 IR
1 Year Yahoo, Roto, G/A/+-/PIMS/PPP/SHP/SHA/GWG/SOG/SH%/FW/HIT/BLK,
W/L/GA/GAA/SA/SV/SV%/ SHO,
unlimited Trades/Waiver
C - Malkin (RW), Spezza, H. Sedin, Lecavalier, Bergeron
LW - Datsyuk (C), Hall, Conacher (C), Perron, Eriksson (RW)
RW - Tarasenko, Hodgson (C), Heatley (LW), Grabner, Callahan
D - Weber, Seabrook, Salo, E. Karlsson, Seabrook, Diaz, Markov, Campbell
G - Crawford, Anderson, Rinne, Lehtonen