I recently bought a 7800 XT for the same reason, NVIDIA drivers giving me trouble in games and generally making it harder to maintain my system. Unfortunately I ran headfirst into the 6.6 reset bug that made general usage an absolute nightmare.
Open source drivers are still miles ahead of NVIDIA's binary blob if only because I could shift to 6.7 when it released to fix it, but I guess GPU drivers are always going to be GPU drivers.