There's no loss going to FAA/ATC. You'll get paid more, and if you want to fly down the road, there will likely be a low paying, long commuting, 16 hour duty day waiting for you.
The only thing that might slow me up is if you're just around the corner from upgrade. If not, punch out. Regional FO jobs will have cycles, but will largely be easy to get for a guy with your experience.
My background is 10 years at a (then) level III center (ZOA, now ATC-11) and then a level 12 approach, SCT. Also, CMA tower.