couple of options –
if it has to be a soundbar ?
no experience of 'soundbars but thi sone has a good review…
I have used Superfi for mail order & they were fine.
TBH though, if you do a lot of movies and stuff then go 5.1 – does not have to cost a fortune
Cables – no need for pricey stuff at all – use smaller gauge stuff that you can tuck down the edge of the carpet…(out of sight, no damage to the property, pull it up and take it with you when you go…)
Maplins, B+Q and the likes have it on spools of 10mtrs or so, for not a lot of money..
If you do think 5.1 then Richer Sounds and Superfi have good package deals.
Have fun…