65K would be part 91 flying 20 hours a month with lots of off time and no charter and no weekends. Depending on what is expected in terms of a schedule, anything less than 75K (plus type) would be unacceptable. The worst the schedule gets, the more the $ should go up. You are always going to have someone trying to "do you a favor" by hiring you at 40K. Just hope they don't have to fly through some 80K WX. Good luck. By the way, is this job in the Dallas area?
That's only slightly above NBAA average for the G100 (A LOT smaller than a Challenger but much sexier ).
The new NBAA survey shows Heavy Jet (35,000lbs+) co-pilot at $72,000. That's averagebase pay and doesn't include any benefits, 401k's, bonuses, etc. Your total compensation needs to be much higher and will vary depending on your region. Also, "a little charter" usually turns into a crud-load of charter. Stick to your guns while negotiating.
BTW- The new AvCrew survey only shows one repondent for "CL601 Co-Pilot". He/She is making 90K.
I would be ashamed of myself (and you should be too) if I seriously entertained the idea of flying a 601 for 45K. When I first posted this thread I was guessing the payscale would be around 80K which was confirmed by everyone here. Do yourself and everyone in the industry a favor and turn that job DOWN.