If you like quality stereo equipment, reviews are a good way to help separate the wheat from the chaff if you’re a consumer, and not an expert. You can look at product reviews online, comments by readers on Audiogon and other forums, and "best of the year" ratings by the major audio magazines etc. and find by consensus what components are among the best out there in your price range. Then you have a reasonable guide to know what’s worth seeking out for a demo. Some of the folks writing above are excellent sources of information.
Unless you live near a major metropolitan area, that’s about as good as it will get for you, short of when you’re able to return equipment that doesn’t quite work in your listening room or with components you might already have. You can often research compatibility too to preclude those type issues. If you’ve got more or better ways to make equipment purchases that would be good info to share here.
Mike