You can do a basic truing yourself with a spoke key... if it's kinked one way just tighten up the closest spoke that goes to the other side of the hub and it will put it back.

You'd end up paying the same as you paid for the bike for brakes, but if you want something good and low maintenance buy a used set of Magura HS33s on ebay. They don't go for much and they're the most powerful rim brakes you can get.