What do you consider "expensive"? And like others asked, where are you going to be commuting to, and what do you consider "too far"?
I don't know if I'd agree with the people on Reddit who told you to avoid Tacoma. It's certainly cheaper than living in Seattle itself, if you can deal with the commute time. Also keep in mind that Seattle is one of the safest large metro areas in the country, so pretty much everywhere is "safe" compared to other large cities.