thanks for the replies guys
ok, as to the 5830s I'm buying them from my cousin for $100 a piece. His roommates complain of the incessant "fan noise" so he's selling

ram is extremely overkill and so is the cpu. You may not need the thermal paste if the cpu's heat sink comes with some. Also I noticed you didn't have a case. I would recommend getting a case since you have never built a computer before. Go with antec Ive always loved their cases. You can also skimp on the dvd drive is you want just install from a usb device.
The 5830 usually takes two slots - and you want to integrate 4 on that board? Using the last slot for the fourth card would mean to obstruct a lot of ports according to the pic of that board.
I have this board and it works fine with 4 5830's
yes, this is not a 100% mining dedicated rig--that's why i upped the cpu and ram. Thanks for recommending the antec cases. They look great..
I found this one on newegg
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129097