Looking for info on headphones

Hello all

I'm curiously interested in getting a pair of headphones.

The problem is I only know where they are supposed to rest wile in action and that's about it...

My aim is not to replace any speakers... just for a change of pace... now and then.

Neither do I want to make a large investment, just sufficient to realize very good sonics.

Is this all possible for say $200 or so?

Lastly... does the aspect of high or low impedance matter?

I'll probably just plug them into a receiver unless there are some which have other than quarter inch jacks as interfaces.

Thanks very much...