oh my....that's a very vague question. buy 1 titan at 1000$ for your amd 5600x2 and youll be set for 5 years...j/k...we need more info. Should i expect a lot better perfomance than i would receive now?
GTX700 might only be a rebrand all the way to the mid range and I don't have high hopes for maxwell. Radeon 8xx0 has some nice improvements here or there but AMD is just holding back right now for whatever reason. The hardware is ready and I wouldn't be surprised if the drivers are close to being ready.