Does the site make any money right now? The easiest way to value a site is by looking at its current earnings. If it is not making any money then there is really no way to value it other then how much it cost you to build and how much the buyers you can find are willing to pay. Not being able to reveal the site or keywords makes it pretty much impossible for your question to be answered and is usually a sign that the site is actually not worth that much. Most people with good sites want the world to know about them. If you do have monetization plans what are they? Why not just list it on a site like Flippa with a reserve and see how it goes. Let the market give you an idea of what it is worth.
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