for $150 you're probably gonna get a shytty soundbar
Its not cheap upgrading your sound
Personally I would go the av receiver and 5.1 setup for somebody new to the game unless you live in an apartment
A couple soundbar options under $200
Yamaha YAS-106
Sony HT-TC180
Vizio SB3851-CO
I have the vizio and sony,use them for my kids room and they're ok but I wouldn't use them.Heard the Yamaha decent
I recommend going the av receiver route though.You don't have to get everything all at once just get a receiver first.Start off with some cheap speakers and then later on get a nice speaker set or you can cop them individually at your own pace
For beginners I recommend a Denon receiver(around $300) and the monoprice 5.1 speaker set(around $200)
Thats a good starting point for beginners
A decent sound system gonna run you atleast $1000
Im about to upgrade to a atmos setup(7.2/5.1.2) and the receiver and speakers are gonna run me about $1300 altogether.....and thats a budget atmos setup
Its worth the money in the long run though because these things last forever
I still have an old 2.0 stereo av receiver in my closet I've has for over 20 years