Current Video Card winning horse?

[Ira Abramov]

Ahoy maties!

The time has come for me to upgrade some of my antique hardware, and I
have ordered myself a nice mega-monitor with the ass-whooping resolution
of 2550X1440. This means the old VGA on board won't do and I need to
look at higher-end stuff (DVI-D at minimum). I googled this issue quite
a bit, limiting google for results only from the last month and still
I'm not sure who do we not-hate this month (I suppose I'm looking at ATI
and nVidia)

Requirements:
- have it play nice with Xorg (Debian/Ubuntu).
- preferably FOSS drivers, but only if rock solid.
- preferably a GPU that supports CUDA/OpenCL (though the only client I
  have for it ATM is BOINC https://boinc.berkeley.edu/wiki/GPU_computing )
- preferably dual-port, so I can send a signal to a secondary
  screen/projector.
- No special gamer mad features needed. The most 3D I'll do with it is
  probably Desktop Cube :)

Thanks in advance!

-- 
A can of Whoop-Ass
Ira Abramov
http://ira.abramov.org/email/