We recently bought an RCA 39" for a family member. Picture is great. The biggest problem is the sound -- Honestly, I'm not thrilled with the sound on any flat screen (and recommend either a good speaker system or at least a sound bar).
With the RCA's there is some good news, in that they have several sound settings, including one that allows you to control the graphic equalizer -- If you don't understand equalizers (I didn't), you can get ideas on how to start with a bit of internet research. From there, it's largely trial and error.