So, I have scoured the internet in search of a good guide book for Washington but there seem to be so many out there. Does anyone have a good suggestion for a guidebook for Rainier, the Cascades and Leavenworth. If I need to get multiple guide books than I will...

Cascade Alpine Guide - pick your volume

Ok, so you ended up asking about multiple areas with multiple complexities.

So, let me say that you should probably get multiple books. While the CAG is good, it's a bit old and some areas could be better with more recent books.

For rock in Leavenworth:
www.leavenworthrockclimbing.com/

For Rainier:
www.amazon.com/Climbing-Mount-Rainier-Essentials-Guide/dp/09>>>


For Other Routes:
CAG is excellent for lower routes.

Also try:
www.amazon.com/Classic-Climbs-Northwest-Alan-Kearney/dp/0966>>>

Summit Routes (top 100)
www.amazon.com/Summit-Routes-Washingtons-Scramblers-Climbers>>>

Good:
www.amazon.com/Climbing-Cascade-Volcanoes-Jeff-Smoot/dp/1560>>>

Yes. You should get multiples. If you're gonna be living in WA, there are guidebooks available for Washington Pass, Index, Exit 38, Frenchman Coulee, Royal Columns/Tieton, etc. If you want real rock guides, look for one of these books before heading to the area. Will benefit you greatly!

leavenworth rock climbing by kramar
beckey alpine guides 1-3
not sure for rainier.
Sky Valley Rock for index
Free pdf for Mt. Erie, PM me if you want.

This website features a good amount of free beta and a full length guide for Frenchman Coulee.

www.justgetout.net/Wenatchee/pages/page/?pgid=91

I agree that it really depends on what your focus is- "Rainier, Cascades, Leavenworth" describes a huge variety of locations and types of climbing.

Here are two general-purpose recommendations:

Selected Climbs in the Cascades (vol 1) is a really good guide for alpine climbs and some rock routes. It has enough classics to keep you busy for a while.

Weekend Rock is a really good book for moderate single- and multi-pitch rock climbing all over the state. It's mostly about cragging/short approaches.

Frenchman coulee was the junk! Never saw another soul the for 5 months out there and some great swimming/cliff jumping. Just look out for gang activity around there. I was warned of it a couple times when I was out there 2 years ago.