I've gone back and forth from naked and standards (FZ1, 919, Bandit 1250) to a sport tourer (ST1300) to a full blown touring machine (GL1800). You can probably get yourself into an '03 or '04 ST1300 for close to your budget amount. It's a good bike, bulletproof and comfortable, but also heavy and not as peppy as the FJR let alone the 919.
Depending on what you need from a sport tourer - more protection, more torque, more electrical power for accessories, built-in luggage - you could make the switch. But at that price point, you'll be getting into an older machine with 20% more weight, and 20% less zip. Make a list of the pro's and con's of the 919 and the sport touring rig, and go from there. You may well find that a new seat, some soft luggage, and maybe a shield will get what you need without sacrificing so much fun factor.
2009 Honda Goldwing
Four wheels move the body. Two wheels move the soul.