3000nm at 0.74M...sounds like what a CRJ-200 conversion with aux fuel tanks will do with a somewhat larger cabin, although I'm sure the Legacy will do it off less runway. Never been on a Legacy, but I was very impressed with MJET's CR2 conversion that was on display at NBAA and imagine they're similar.
Both are excellent large-cabin options if you don't need nonstop international range...