Having an enjoyable trip requires having gear that does what you need it to. We tried to pack small and light which led to a lot of research and purchases of new gear from multiple retailers. Unless you have a pile of money laying around, I would recommend spreading purchases over a period of time, looking for sales, utilizing old and used gear, and becoming a member at REI so that you can get some money back. 

If I were to do the trip over again, I would bring the exact same gear. The items below kept me cool on the hot days, dry on the wet, and warm on the frosty mornings and nights.