Bought a new TV, should I add a theater system?

[mom of 3G's]

We finally splurged and bought a 42" plasma TV. Before this the largest TV in our house was 26". Now that we have it and see how great it is, I'm wondering if it would be worth it to add a theatre system. We don't have cable and only watch "free" local TV stations, just got a Wii, and watch very few DVD movies, although oldest DS is now 8 and seems to be more interested in movies (the other 2 can't sit still). I saw one on Amazon that I am going to try and add the link to. I don't want to spend a lot -- I think this one was $229.

http://www.amazon.com/gp/product/B0...&pf_rd_t=101&pf_rd_p=470938811&pf_rd_i=507846

Found this one at Walmart which is more in my price range:
http://www.walmart.com/catalog/product.do?product_id=11319409&findingMethod=rr

Any reviews on these would be greatly appreciated.

 

[The Princess]

Yes, we have one and its great~especially if you have video games the sound makes it even better.