Not the management position I hasten to add, only my personal opinion, but I'd be tempted to just use the main div B737-800 - the BBJ2 and the B737-800 are pretty much the same.
Unlike the 737-700 and the BBJ, the BBJ being a whole generation better than the plane it's based on, the BBJ2 is very like the B737-800 in terms of specs and range (other than it's got the blended winglet package installed... if you've got the PMDG model, make sure you use the winglet variatle)