well i would say go with a "chieftech", they are made by termaltake, chieftech, ....
they are kinda big, but that makes you able to mod it, cool it, .. very good.
if you want a smaller case, go with a lian-li.
prices are all the same. just watch you buy a alluminium case, instead of a steel one. steel ones are just to heavy.
for the PS, it depends on how much you are going to install, and mod. if you are going to install much :
450-550W
if you arent: just 350-420