Whats it worth? Polk Audio speakers & Onkyo DV

I have a complete set of Polk Audio speakers which are connected to an Onkyo DV system which i would like to sell but would like to know what i could sell it for, either as complete set being the entire speakers only, or with the Onkyo DV and DVD player.

Onkyo AV Receiver TX-DS989
Onkyo DVD DV-S717
Onkyo Blu Ray BD-SP308

Polk Audio speakers in Cherry wood
RT-3000 main speakers
CX-1000 centre speaker
F/X-1000 surround speakers (total 4)

Any ideas or suggestion will be appreciated.
Many thanks