I use Push2TV through WiDi.
It’s wireless, connected to my surround system, anything on my computer is displayed and played right on the flat screen.
It’s also capable of 5.1 surround as well as high def.....for a purchase price of less than a $100.00, you can’t beat it!
For some reason I don’t trust any wireless feed for video/audio to my TV.
I got the impression that “ChromeCast” serves more like a alternative to your cable box, but can be controlled with another device.
If so, and for $35, it seems like a really big deal.