There are a lot of good clothing options, but unfortunately the most promising are prohibitively priced. Just like with knives, designers have started to incorporate space aged technologies into outdoor gear, and just like with knives, the equivalent of ZDP-189 and Carbon Fiber causes prices to quadruple.
I guess the most important consideration is your price range - you're obviously going to need some good insulated clothing since you're in WA, but it really depends on price.
Arc' Teryx makes some of the best cold weather solutions available, but you could spend up to $1,000 getting outfitted. If you were a professional guide or something the cost might be justified (or a millionaire), but since this is your first time camping it isn't in my opinion. I have been able to accumulate a small amount of high end outdoor clothing over the last 5 years though, and it does help when you use it as part of a system. The new materials weren't arbitrarily chosen as marketing gimmicks - but there is diminishing return. North Face is cheaper for a Jacket, and uses many of the same materials. I have an Arc' Teryx hoodie that was given to me, and with a pair of Merrell hiking boots I got last year are the two most worthwhile and comfortable pieces of clothing I have for hiking in the fall/winter. Unfortunately I have never been able to test the Merrell boots over a long hike yet.
Look at
Outdoor Research
Patagonia
Companies that Make Hunting Apparel
Gore-TEX is great for footwear and outer layers. It is water proof
Merino Wool is a fine cheaper material
Some cotton and polyester blends work great too
You might be just as well off to take $200 to Wal-Mart and look for cheaper alternatives to start. There should be clothing available with the properties you're looking for. You may not like hiking in the cold, and if that's the case spending 800$ on gear will be a huge mistake.
ETA- In my opinion, your base layer, outer layer, footwear, socks, head cover and gloves are the most important purchases. Just don't use a material in the intermediate that defeats the benefits of a quality piece of clothing you wear over or under it. If you're going to spend, do it in those areas.