A bit like a child actor, it is easy to get type-cast in the LHS of a TP after a few years. The first few thousand hours in your logbook are good but after that they will not make you any more employable.
Take the hit hit now and within three or four years (depending on the operator) you will be earning the same as Kingair skipper but with still plenty of headroom for further pay rises in the LHS and/or training. Flying small TPs is in all likelihood more fun with more hand flying, more visual approaches etc but if you end up with one of the larger Locos you will still have the opportunity to fly to some challenging and rewarding destinations from Greek islands to Iceland and many points inbetween.