ONLY, and I mean ONLY get a wireless surround sound system if you don't mind shitty quality sound and you absolutely need to be without wires.
Get the wires, and just lay them very discretely. It can be done.
And remember, just because the wire the set comes with is only 6ft doesn't mean thats the end of the line. You can always get longer cables.
What I suggest you do is find a good speaker set you like.
Then plan where you want to lay them and how you'd lay the wires (under furniture and on the floor against the wall are the two best methods, other than drilling and working the wires through the walls themselves) and see how long of cables you are going to need. If you need to buy any longer ones, get those at the same time as you get the speakers.
Then put together, and presto.
But yea, theres really not a lot for decent wireless speakers, unless you're looking to spend about $6-8000 for a set.
If thats your price range, then you can get some really nice wireless speakers.
But most people don't want to spend $6000 on speakers. (or well, not that they don't want to, but they can't)