Selling a well established website

I realise this may not quite be "off topic" as such, but it's also not necessarily about making money online in the way the forum is used. If there is a better spot, I do appologise.

I have a website, which has been active since the beginning of 2004. It's prodominatntly a forum and is well used - averaging over 10,000 visitors a day (unique) and making an ok profit from ad revenue, affiliate sales, CPA offers, etc.

I don't want to boast, but it's not a small site.

After 5 years, I'd like to move on. I'm currently working on a different site that I'd like to be able to focus solely on. The one I want to sell is completely automatic, however I would like to move away completely.

Can anyone help me on a good place to sell it? Or how to sell it? I don't want to put a "this site is for sale" sign on it as I'd like it to happen without the members who use the site knowing too much about it. I don't really want to answer 100's of curious george emails.

So far I've found a few places, but they all seem to sell smaller sites - $xx to $x,xxx amounts. I'm after more ideally, but also not sure exactly how much it's worth and don't want to rip anyone off, or miss out myself. Which is another reason why I'd like to find a place to sell where higher price websites are sold and the people buying have a better idea of what a site is worth.

Can anyone help me out?