I have my PC connected to my TV thru a USB/HDMI wireless connector.
Here are some choices...
Wireless TV to PC
I believe with Chromecast you're limited to Youtube, Google, Hulu and Netflix? Unless you have a Chrome browser, then you can watch anything from your PC. Whereas, I can watch anything from my PC to my TV, on Firefox or Explorer.
Here are some reviews..
Chromecast Reviews
There are actually some free sources for movies if you hunt around.
No you are not limited to Youtube, Google, Hulu and Netflix. You can also cast from any DLNA server via various apps. Plex is on there as well. There are also games.
I got mine today and playing with it to see how powerful it actually is. Now here in Spain we dont have Hulu or Netflix, but Youtube and Google Play works very nicely.. choose movie on tablet, PC or phone.. press cast to Chromecast and it starts up and you can use your device as a remote.
Next will be getting it to play local files from my media server. The problem here is figuring out which way I want to go heh, not if it can do it or not.
The differences between the various options are the following.
Apple TV: Locked bigtime in Apple universe. Very little cross platform support and limited video codex support. Works great if you are in the Apple cult and willing to buy expensive content in iTunes.
Roku: Powerful box, but semi closed system. Apps for mobile phones and tablets are available, plus the remote according to those that have used it be..interesting. Lack of browser mirroring was a deal breaker for me. Lots of apps and possibilities. Finally got Slingplayer .. about bloody time!.
Amazon Fire Streamer: Closed system, bound into Amazon content. Lots of potential, but still not open. Voice control is interesting, but in theory Chromecast can do that too.
Chromecast: Open system and cross platform (the biggest platforms only). Use Apple iPhone..you can use Chromecast.. Use your device to choose content and stream it directly to the Chromecast. Because it is open source for the most part, then more and more are adding the support to their apps or webpages. Plus browser mirroring works pretty well. CHEAP!

Makes your dumb tv to a smart tv.
For me the price of Chromecast made it no brainer. Even if it does not work as I want, the potential is there so it might one day... the price of 35 dollars/euros (yes we get ripped off) is so cheap that it does not matter. I would have to actually think about it before investing in the other options because we are nearing the 100 dollar/120 Euro range.