Good website design attract the visitors to your sites, it is just like a house which is look beautiful form outside and inner, so that everybody like to stay there, and a website which designed properly do visitor's spend maximum time upon it..
perform the onpage and offpage activities like keyword reach and directory submission, bookmarking submission, article submission, forum posting and blog comments..
Generally simple sites are designed by clients requirements so it should be designed at range of 10 to 500 $ but remember this is just an approximation and for more in you can contact to "speed limit studios" based in new york company..