Toggle bolts work good on plaster.
Toggle bolts can do damage to plaster especially if it is the older plaster and lath.
Ryzart......are you absolutely sure it is plaster? And if so, do you know how it is put on? That would make a huge difference on how anything gets mounted. If it is the old plaster and lath, then you DO NOT want to run any anchors between the studs. That would be a guarantee for damage, as the old P&L weakened over the years and chances are that the plaster "keys" have already broken off in places. If this is what your type is, I would run a wood strip from stud to stud where you want to mount.
http://en.wikipedia.org/wiki/Lath_and_plaster
If you have drywall, which some may call plasterboard, then there is a variety of anchors that can be used. DO NOT drive them in with a hammer. They make a few types that you drive almost all of the way through with a hammer, then finish them up bt screwing them with a screwdriver. Driving them with a hammer, risk the chance of blowing the drywall out on the backside and you will lose probably 3/4's of your holding power. Drill your hole through first at the proper size, then final torque them appropriately.
They also have a blueboard / plasterboard, that had like a fine mesh chicken wire over it, then a plaster skim coat over that. That style was popular in the late '50's early '60's.
Then they also have a plasterboard that the skimcoat of plaster goes directly over that. No chicken wire in it.
So knowing what type of plaster you actually have would make a difference as to how you mount items.