Hi Suza,
Parklane Mattresses is a DBA of Paramount Bedding and Paramount was their original name before they began selling direct to consumers and became known as just Parklane Mattresses. You can see a little of their history here. There is also a Paramount Sleep in Norfolk, VA and a Paramount Mattress which is based in Los Angeles, CA neither of which are connected with Parklane.
Northwest Sleep is a retailer in Delta, BC which sells mattresses made by Parklane Mattresses (which is why their site looks similar). They are also not be confused with Northwest Bedding which is a manufacturer in Spokane, WA.
The better options and possibilities I’m aware of in the Portland area are listed in post #2 here and includes Parklane who are one of the members of this site which means I think very highly of them in terms of their quality, value, and service and I believe they compete well with the best in the industry.
Hope that clears up some of the confusion.
Phoenix