Define not to expensive, how should I define it? I want something as good as the unity3d site, in fact I based the information I created on the information they

Define not to expensive, how should I define it? I want something as good as the unity3d site, in fact I based the information I created on the information they give about their software (Because the framework is really excellent) if I want a good webdesigner what would be realistic for a site in that direction? 1k, 2k, 3k? 5k? in that direction of quality (www.unity3d.com)