For those of you using Nikon flashes... Does anyone use the SB-500 or SB-700? Nikon has the SB-500 in their refurb store for under $200 and I'd like a first hand account. I'm using a D750 and my SB-400 has gone missing. Is it much better to get the SB-700 or other instead? As far as I can tell the main missing features of the SB-500 are less flash coverage at wide angle, no AF illuminator and no gel covers.