You can buy 2 x FX8350 for that money.
Certain things will benefit from 8 cores...
Games? Not so much.
(Great for my BOINC team though!)
I'm going to grab an FX8350 while they are on-sale for only $195 bucks (Canadian).
But yes, your 3-monitor SLI setup would prefer the 3570K.
so there will be only a few fps difference between 3570k and 3770k?