From reading this thread and being interested in the corporate world the 3 types it appears are "great to have" are the LRJET, CE-500, and GV? Not sure what those officially are on the certificate but it gives you the most options across the board. That being said I do want to at least ride up front in a Challenger to see the differences between the "original challenger (604)" and the CRJ-200 (which is a PIG).
1 thing that is awesome about the -200..... I commonly have a FDX guy in the jumpseat (based in MEM) and they ALWAYS freak the hell out from about 100 ft to the ground. I guess its the throttles to idle, nose DOWN, and the 10-15 degree pitch difference from 20ft to the ground.... Entertaining!