I have used http://www.jrank.org in the past. It takes a day or so to get crawled and indexed, but once done, it works very well.
i had some trouble at first too - it just takes a while for that first crawl but is pretty good after that. if you're not getting any error messages, i would give it a day and then it should start giving results
Was it the site in your sig that you needed the site search for? Looks like a decent search you're using - what did you end up going with? Thanks!