When I wanted to value my record collection, I used Nick Hamlyn's Penguin Price Guide and found it really easy and reliable to use. With the records listed alphabetically, it is simple to find the titles - unlike other guides I have seen where for each artist the records are listed in chronological order under a number of different format headings - very confusing if you're not an anorak! The book also has a number of useful rarity charts and is filled with fascinating pieces of extra biographical and critical information, making it a really good read as well as a list of prices. For my money, the Penguin Price Guide stands head and shoulders above the competition.