Hey Allen,

Kevin hit it right on the head. The types of applications you've compared (Youtube and Myspace) require a LOT of coding. It is a very time consuming process and not only are you paying for the time, you are paying for the knowledge your designer possesses. Just trying to give you a realistic head-up before trying to find someone, be prepared for a large pricetag.
On the other hand, if you give us a more specific idea of what you are trying to do, depending on your timeline, you could probably put together most of it yourself and only hire out the very specialized work.

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