gaming computer????????

so im building a computer at the end of this year for gaming
it specs

Intel core 2 qaud Q9550 2.83GHz / 12MB Cache / 1333FSB (how can i overclock this to 3.2 GHZ safley?)

Asus P5Q-DELUXE Intel Mainboard - 4x DDR2 / 8x Sata Raid / 1x IDE / Dual Gigabit Lan

Corsair DDR2 2GB PC-8500/1066 ( but ill get another set of this so its 4GB ; ) )))

Seagate Barracuda 1TB 7200RPM 32MB SATA 3Gbs ( is this HDD good?)

Gigabyte radeon HD 4890 oc'd edition 900 MHZ vs standard 850 MHZ (how can i overclock this to 950/1000 MHZ safely?)

Antec Nine Hundred Two - Black Ultimate ATX Gaming Case (this is good for cooling ya??)

Antec TruePower New Series 750W ATX Power Supply (Blue LED) ( is this good for gaming??)

Samsung 21.5" P2250 ROSE-BLACK LCD - 2MS / WUXGA 1920x1080 / D-SUB / DVI ( is this a good

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