I'm going to echo Howie's sentiments about waiting until EDGE is released before upgrading. You're shooting in the dark otherwise and that's a lot of money to spend without knowing what it's going towards. I can understand the pressure to upgrade, especially with your mentioning that you're running a notebook right now (yikes!) but, all things considered, I strongly urge you to wait until DCS gets its act together and gives us a proper multithread processor, GPU supporting sim.
I'm also dying to upgrade but have no idea what I'll need to run EDGE. There's even a chance I won't need to: I've got multi-threading turned off and my 700 series AMD GPU isn't running anywhere near capacity. If EDGE delivers, my rig will finally be able to bare its teeth.
Here's hoping!