The answer is extremely simple : make a hackintosh and use FCPX.
go to http://www.tonymacx86.com
more specifically buy this http://www.tonymacx86.com/333-building-customac-buyer-s-guide-february-2013.html#custo_pro and get two Dell 27 inch screens at 2560 x 1440.
This will certainly cost less than $3500
The only thing to be careful about is to get a graphics adapter with two DVI dual link connectors otherwise the screens won't show their full resolution.
If you decide you prefer Windows this same specification is just fine as well !
Well, one nice thing about today...is Virtual Machines (VMs).
My recommendation, is to get the fastest machine you can get or put together, and optimally, make it with specs that the Hackintosh crowd can work with, and that way, just install VMWare or VirtualBox, and then run whatever version of windows, OSX or Linux you want to run, and have the best of all worlds.
VMWare is getting pretty good of late, and will support just about any setup you wish....so, wny not have audio tools like Rosegarden http://www.rosegardenmusic.com/, or Ardour http://ardour.org/ running on Linux for sound, FCPX on OSX, and Adobe on Win7 if you prefer (or Win8....*shudder*).
Don't forget things like :
The nice thing about today is, you aren't stuck on one platform if you don't want to be, the operating system is quickly becoming a commodity.
I prefer the Unix/Linux based ones, but hey, every job has the proper tool for it...