What specifically are you looking for? How far away are you willing to go from the greater Seattle area?
Boeing Field is the closest to downtown and has a number of schools...Wings Aloft, Galvin Flying, Aviation Training Center (ATC), to name a few. They have newer aiplanes and nice fleets but are, IMO, unreasonably priced. For example, Galvin has a few newer non-glass 172 SPs that are $135/hr, plus an additional fuel surcharge, and that's the rate you get after you pay their club fee of a few hundred dollers per month, if I recall correctly. I remember doing the math and it worked out to something around $180/hr after all is said and done. But on the flip side, they have nice airplanes that you can't rent elsewhere, such as a new Columbia 400 w/Avidyne Entegra for the low low price of $308/hr, plus fuel surcharge, plus monthly membership fees. The also have Diamond DA42s, Beech A-36, etc. Instructor rates are not cheap--$55-65/hr depending on the training (!)
Paine Field in Everett also has a number of schools...Regal Air is the most popular, but they are also unreasonably priced to many folks, and their fleet isn't as nice as Galvin's. You'll be paying at least $150/hr for a Skyhawk after all is said and done with membership fees, fuel surcharges, and the like.
Tacoma Narrows has ATP (as mentioned in the post above) and a school called Pavco, if I remember correctly. I don't know much about them, but I do know they have a couple of newer Skyhawks well equipped, and a couple of Stationairs.
I would recommend ProFlight in Renton. They have some older M-series Skyhawks, but one of them is nicely refurbished with GNS430s, if I recall, and they have a Cardinal RG and a Dutchess(?). They recently lost a Cardinal in a presumed crash, sadly. Their rental rates are more reasonable, closer to $115/hr for their Skyhawks, and $140 or so for their Cardinal RG.