Hi alanabanana,
The better options I’m aware of in the Boise area are listed in post #2 here.
Hopefully you’ve also had the chance to read the first post in this thread which has all the basic information, steps, and guidelines that you will find most useful in your mattress research.
Diamond makes some good quality mattresses that are usually “better than average” in terms of quality and value but you may have some difficulty finding out the specifics of the materials they use in some cases (see post #2 here).
Englander is a licensee group with many licensee factories around the country each of which can make different mattresses and use different quality of materials. Some of them I wouldn’t consider (because of the use of lower density polyfoam) and others use good quality materials and have good value depending on the specific mattress and retailer.
A mattress is only as good as its construction and the quality of materials inside it and all manufacturers make lower quality and higher quality mattresses so rather than going by brand it’s always wise to make your buying decisions based on knowing exactly what is in the specific mattress you are considering so you can make more informed decisions and make meaningful quality and value comparisons with other mattresses.
Dealing with retailers or manufacturers who can provide you with all the specifics of what is in their mattresses and have the knowledge and experience to educate you about the different types of materials and their advantages and disadvantages is one of the most important parts of a successful mattress purchase.
Phoenix
PS: There is also a Diamond Mattress Factory in Salt Lake City, UT which is a smaller manufacturer and if this is the Diamond that they carry then they would be well worth considering because they are open and transparent about their mattresses and appear to use good quality materials and have good value. They don’t have a website.