Do you know what a budget sound bar is?
VWhile inexpensive soundbars are great, it's worth being aware of future audio trends and considering 3D audio to be the way of the future, especially as it applies to home entertainment.
If you've never had a home theatre receiver and you don't want to go through the process of setting up surround sound speakers, a soundbar is a perfect choice.
If you just want to boost your TV sound, a soundbar with 2.1 channels might be enough. If you want true surround sound, buy a soundbar with wireless speakers for multichannel sound.
A sound bar itself uses 20-50 watts. If you have a subwoofer and rear speakers, the wattage increases because you have additional devices.