ok then, with hdd ata 100 means atapi interface 100mb/s same with ata 150, not familiar with sata 3.0. unless you are running raid, get ata not sata, cheaper & sata bandwidth isnt used, the only con to ata is the wider cable restricting airflow. Id get an ata 100
Any SLI mobo is a good mobo for gaming (SLI's only purpose is gaming) a popular opinion is dfi is better but ultimately its your choice & asus have been reliable for a LONG time.
for the OCZ RAM http://www.newegg.com/Product/Produc...ubmit=Property
pick your price of those
that ones a featured product & is good
essentially if you arent going to overclock, just get the value ram
i hope this helps