Today AMD is releasing their new Radeon HD 6790 which is targeted at the $150 segment that recently saw some love from NVIDIA in form of their GTX 550 Ti. AMD's new card uses the same GPU as the more powerful HD 6850 and HD 6870, so it will be interesting to see where it stands and whether it can defeat NVIDIA's latest offering.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips