The OCZ gameXstream700 is an alright little power supply based on the FSP line of PSU's from memory. I think its also a small power supply so case choice doesnt become as limited as say with a Galaxy 1kw which i can tell you is HUGE.
When choosing a case buy the best you can afford, you're going to have to look at this box every day for a while so may as well pick something that is aesthetically pleasing to you. Buy quality and buy what you like.
Some of the boys here run LianLi exclusively (Might buy one myself one day

)
I like my Coolermaster stackers, the STC-T01 is my favourite though its big, its heavy
and I can fit everything in there, doesnt have an easily removable mother board tray which could be helpful to the 1st time builder so be aware.
Silverstone make nice cases, I like the TJ07 and TJ09
I nearly bought a LianLi G70 the other day but talked myself out of it, the PC60 plus looks nice if you want a mid size tower.
Young 64Dragon has a build log here using a Silverstone Tj07 which looks really nice:
http://asustech.15.forumer.com/index.php?s...t=0entry28271