What do you collect? The C&W (The Official...) is a year or two old now, there have been "finds" since the publication that wouldn't be reflected in their pricing. I don't think they give "full coverage" to LE's and roulettes. HOWEVER it is FILLED with color pictures of hundreds of House chips. (including some non-Nevada)
TCR (The Chip Rack) lists every Nevada chip known to exist, and is published every year. It keeps current on LE's, lists all known roulette colors, and many "variations".
As a Nevada collector, I consider BOTH to be "MUST HAVES". If you decide to get TCR, go to Andy's site...he has the best price I've seen.
Since you're a club member, go to the club Library....I'm sure you'll find both books there. Check them out, look them over, then make your decision.