Bulldozer has not been released for desktop users. Any Bulldozer chips out there are for servers. I would wait until it is released for desktops before upgrading.
Release is tomorrow, so waiting is the best option. Just avoid the BD Rumors thread ATM. Lots of off-topic stuff because of the whole 18 (14 for the guys across the pond) dilemma.
I would keep your current setup. A pair of 6870's have a lot of power and an i5 760 @ 4.0GHz doesn't require an upgrade at all.