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Directories like Web Hosting Directory will help you to find all you need. I think directories will provide you full informations, not only informations but also reviews and ratings. In that place, everyone can vote or read all of the reviews and ranks. You can trust a product by viewing what the previous customers say. If they say it is recommended for you, I guarantee it will satisfy you. But if you found many negative reviews, I think you should close the tab on your browser and start searching for other products.
Now, the question is: Are the websites in directory is qualified? I say yes because after looked a Free UK web directory I found all of the recommended blogs is qualified. They has quality and I think the administrator has spent hours to check the blogs. If the administrator found it has good design and content, it will be approved. However, if he find it is bad and not recommended for reader, of course it will be rejected. Thus, you do not need to worry about the quality and I say: trust it! However, not every directory do, only some sites.
Another feature I recommend is Dating directory. You can open your favorite browser like Opera or Mozilla Firefox and enter Google.com on the address bar. Then, you can type some words related with the keyword you want to find. You will find ton of them but, how to qualify them? Confused of choosing one of the millions? Again I recommend directory. You can find dating sites and agencies there. Click the linked text in the early paragraph and find the best that you search. You can qualify them by viewing the pagerank, design by Joomla or not, comments, and other sectors that help you. Ok, just a simple article, but I hope this will help you.