Try the Q-AV system. It comes as 3.1 (soundbar and Sub) or 5.1. I've currently got the front soundbar (L-C-R) and two satellites (I have Montior Audio Sub) and they are great. Loud enough for my wife to complain, the dialogue is crystal clear and looks neat under my telly.
Not sure if I can plug e-tailers on here but Phil at MustAVit breaks the package up and sells the components individually - so you can buy the soundbar or the sub separately. I got the table top stand and the soundbar from him a couple of months back and haven't regretted it for one minute.
You can prob get the 3.1 system for about £450 or thereabouts and the soundbar for £225 without the sub.