If you wish to clone these configs directly from git, clone
git://github.com/cdown/tf2configs.git.
autoexec.cfg in
%PROGRAMFILES%/Steam/steamapps/%username%/team fortress
2/tf/cfg.
-dxlevel xx from the launch options.
Screenshots are available here.
dx9frames is a highframes derivative designed to work without issue in DirectX 9 mode. highframes offers high performance without destroying the TF2 look. maxframes foregoes everything in the pursuit of performance, but it will likely not perform much better than highframes on most setups.
highquality should offer similar visual quality to maxquality at a significantly less pronounced cost to game performance.
medic is my personal config that I have developed over the years playing medic in competitive TF2.