Hey man im pretty much in the same boat as you. With 4500TT and no turbine time. I have put alot of thought into going to a regional, but every time i go to pull the trigger something gas stopped me. Now i am very glad i stayed instructing. I am about to start flying my school's king air which will be all TPIC. I also make good money. If you are set on flying a jet look into some if the smaller fractional companies. I know executive airshare out of KC hires alot lower time guys than you to sit right seat in there Phenoms but you will work alot. Also you could probably find a flight school that does turbine transition training and work your way into there King Air pretty quick with your TT.