Appreciate recommendations on NE Washington fishing

We're planning on heading out in the Spring to NE Washington (and
maybe Idaho) for some fishing and also plan to look for some land for
a summer place. I've been looking at real estate ads for the area and
prices seem to be a little better than many other parts of the US.
We'd really like some acreage on boatable/fishable water-- either a
large river or a lake. I'd really appreciate any suggestions on lakes
or rivers that we should check out and what fish we can expect to
catch. (I've seen a number of ads for land on the Pend Orielle and
Lake Roosevelt) I'm not really quite in the "avid fisherperson"
catagory yet...but we just got back from fishing some Montana lakes
and our RV freezer was packed with our limit of trout! I think I'm
hooked!

Sandy