If you don't mind an 8-block walk, a really good price-to-value ratio looks to be the Jupiter Hotel, still on the same side of the river. Complimentary wifi included, for about $90 a night. They describe themselves as:

A new experience in Urban Hospitality, the Jupiter hotel offers 80 modern boutique guest rooms featuring Blu-Dot custom furnishings, black board doors, convenient location to the downtown entertainment district and convention center,complimentary high speed wireless internet service throughout the entire hotel and more. Our on site restaurant, The Doug Fir, is a post-modern classic, featuring eclectic Northwest Cuisine, serving breakfast, lunch, dinner and late night dining from 7am til 4am daily. Awesome cocktails, an incredible lounge and club, the Doug Fir is the destination for global nomads.