Comfort and ease! Clothing is pretty individual and depends on climate. With clothing I usually go for cheaper unless I KNOW it is something i reaaallly reaallly like or am spoiled to. Running tights are usually something I pay a little more for...cheaper versions dont keep me warm and like to slide down like bad panty hose! nothing like hiking up your tights every 5 minutes....or..well.. the alternative! I really like injinji socks. They are 5 finger socks. They keep me from getting blisters between toes on long runs. I also pay a little more for hydration packs. I love the Ultimate Direction line, I have the Wink. Super light, balanced, doesn't bounce around or rub raw areas. But... I have found a new love in the nathan synergy dual hydration bladder...I just bought the bladder seperate and put it in my Wink hydration pack which has worked well.