dont use a trackball... no one uses a track ball for serious gaming. I am using the mazer e-3lue i bought off amazon for 16 bucks check out the reviews. Its nice.
As for graphics cards, please please shop around before you buy any radeons right now ,becuase of cryptocurrency mining they are off the charts more expensive than the MSRP.
also check out
www.reddit.com/r/hardwareswap there are lots of times people selling NIB graphics cards or slightly used one far cheaper than retail