The GTX 780 is for all intents and purposes, a really well executed part. The only moot point is a strong retail price that takes it off the list of many end users budgets. This I suppose is where the NVIDIA GeForce GTX 770 is meant to come in. For those with GTX 680's, your upgrade cycle (if looking for more performance) is fixed squarely on the GTX 780, which offers significant, quantifiable gains. You are certainly not the target audience of the GTX 770. The GTX 770 will, however, look enticing to those from a few generations past, perhaps those with a GTX 480/580 or AMD Radeon HD 5870/6970 where the performance gains and price may urge many to consider now as a good time to upgrade.
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