Search engine recommendation (htdig vs. udmsearch vs. glimpse)???

Hi - I am looking at wrapping php around a search engine (probably one of the above) that will be indexing local text files (which if necessary I could index through a web server) and was wondering if anyone had any experiences with the above? I've seen the article on devshed about htdig. Basically rather than install them all and benchmark them I was wondering if anyone could share which one performs the best. For my specific case, I would imagine about a maximum of 50,000 documents, all text files, no more than 10K each. Once indexed, they would never need to be re-indexed (ie, they won't change). Suggestions? Thanks! -philip