Which channels do you have accsess to? Not all of them support 5.1 audio, in which case a sound bar would be fine. I know for a fact ITV don't do 5.1 for anything as they don't have the set up to do so.
I think most of the Sky sports channels broadcast 5.1 so a good AV receiver will give you the best experience and should put you inside tha stadium with people all around you. as long is its all set up correctly.