Well you could save $5 odd for this one: XFX P1-750B-CAG9 750W Black Edition
$125 for a 750W unit.
You certainly don't need an 850w unit. I think you barely need a 750W one. So if you want modular, go for the 650W editions of the XFX or Corsair HX. The only reason to go more powerful is to keep the system for a very
long time or the PSU for a second build.
If you have a case that mounts the PSU in the bottom then the necessity for a modular PSU is reduced considerably compared to a top mounted PSU case.