"Is there a better paying version of GORS anywhere?"
Not that I'm aware of. The two main concentrations of Operational Researchers seem to be in the public sector (typically GORS) and management consultancy (IBM, PA, etc.).
There are other policy/strategic OR career paths that offer equally interesting (in my opinion) work to GORS e.g. the MoD and its various agencies. However, pay is pretty similar.
True OR careers in industry are pretty rare and aren't always any better paid than GORS et al. The big engineering firms employ some OR specialists for their transport and networks teams, but you'd be on engineer salary scales (i.e. not fantastic and relatively slow growth).
If you're willing to stretch to "OR-related" work, then the best organisations to look at would be those that value scientific management/metrics-oriented approaches (e.g. Capital One, RBS). The best-paying career route to look at would be quantitative marketing (which may be in one of the aforementioned organisations or may be in a specialist advertising/marketing agency).
As you go down this list, you're getting further away from the "interesting policy work" of course. "Quantitative marketing" can pay well but finding ways to increase the hit-rate for junk mail by 0.0001% isn't necessarily the most fulfilling thing in life. Even if you end up doing the same kind of work with GORS, at least it'll be in the knowledge that the mailings are something vaguely useful like voter registration cards.