RAM : In order of preference - Corsair Dominator/Corsair Vengeance/GSkill RipJaws DDR3 depending on what your mother board supports in terms of speed (1333/1600mhz etc.). I am sure you know, but no harm mentioning - whatever size you go for ex. 8 or 16gb, break it in 2 sticks; i.e. instead of using 1 stick of 8gb or 1 stick of 16gb use 2 sticks of 4gb each in case of 8gb ram in total or 2 sticks of 8 gb each in case of 16gb ram in total.
Casing : Now this is a matter of personal preference. You like jazzy/simple/functional/Size. I personally love Corsair Carbide 400R (there is a newer version 500R now but I haven't seen it). The 400R is a spacious mid tower, very well ventilated, SUPER QUIET, great cable management options and has 2 USB 3.0 ports in front with backward compatibility with 2.0 and it looks very nice (I love simple and functional). If you want
(** Amazon links are just provided to give you an idea of the price and the exact model I am talking about.)