@Lotherio Good luck. What sort of place will it be when it's finished? I might be interested in having a look at it.
Back on the original subject, there is, regrettably, no "perfect" Star Wars game system, but D6 got as close to the feel of the Star Wars galaxy as any system ever has to date, and, even with its foibles, is still the most accessible outside of MUSHing, and the easiest to learn.
FFG is almost as good, but has its own issues; I've only ever seen one FFG Star Wars MUSH come to fruition, and it died in less than a year (it was a niche sort of game, admittedly, or it might've lasted longer). A second, earlier game never got off the ground; the creator got disenchanted with the system a few months later, and tried to solicit interest in making it a SWSE game instead, but got no bites. The system code that was used in the first game was apparently very tricky, and was never quite in tune with the on-paper game system, though it got close. I think I heard that it was built from a GeneSys system for a different MUSH, which works just slightly differently than the FFG Star Wars system.