Hey, I'm a SimuFlite SIC guy on the Beechjet.
I highly recommend it, if you can swing a flight instruction job at the same time. The networking has been great, and I've had a few job bites and offers in the process. Without any sim time I'm only at 710TT/22ME, but I've got my PIC type in the BE400 and am well underway on a second type.
You probably won't get to pick your aircraft, unless you happen to know that aircraft's training manager. You'll be placed in an aircraft where SICs are most need. Right now that happens to be the Citation. The Citation is a good program, along with the Hawker, since they cover multiple aircraft.
-Brett