lazydog: Hi Alm888
I am using an AMD Radeon 5870.
AMD shouldn't be a problem
i build 2 pc both with 5770 and i was able to play games with proprietary and open-source drivers (i.e. Insurgency, tomb raider 2013, dead island riptide, fallout 3, mortal kombat 9, xcom, dishonored, and some stuff with dolphin-emu).
you should nail doorkickers IMHO.
you can easily check witch drivers are installed in the terminal by typhing
glxinfo |grep core
amd's open-source drivers run great with dx9 games with gallium_nine drivers and wine enabled, you can get the latest open-source drivers with gallium_nine enabled by adding the OIBAF ppa
[url=https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers]https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers[/url]
as for doorkickers you can check trough the terminal if that library is installed by typing
apt search libgl
then scrolling all the way up to check if they are installed (if there is an "i" on the left side they are installed)
ps. i've attached a screenshot