I would be happy with a 4 multiple also, but not happy with the Capital Gains on that. I have been running the site since 2006.. Bought it as a premium domain even back then from BuyDomains.
We are top 2 position for the keywords on every major search engine, and never budged last Panda update. This is a news site, not a crappy content site ;-)
I enjoy working on it despite it taken up a good chunk of my day.. I guess I could sell out for less I have had plenty of firm £150k offers (5 this year) which would normally tell me that this is the market price. However I know and they know what is around the corner so it was a great investment, returning over 2000% over cost so far and one agency today just booked a 6 month... I think even were I to get 250k it would be a reluctant sale at that.
Shall mull it over some more I think.. thanks for all comments.. appreciated and noted.