Summer's G1 guide is the best printed ID book for the US G1 collection. The price guide is reasonably accurate and has held up well over the last few years since it was published, but keep in mind the pony market constantly fluctuates and printed price guide books can never be 100% up-to-date to reflect the current market.
As far as a place to catalog your collection, check off items you have, make lists of items you want, and drool over pretty pictures... this book is perfect.
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