i'm not personally a fan of gigabyte mobos, just because some of the chipsets they use for sound, network, etc...but, if you get a good one, it's going to be solid.
you may want to swap that ocz agility 3 for a vertex 4, crucial m4 or maybe a Samsung 840 pro series. the agility 3 doesn't seem to be as durable as the others.
I agree with gyrene for the most part...
I would also opt for a thermaltake ( by seasonic ) 600w thru 750w PSU series ....... prefer using ASUS MB or ASROCK MB over all other brands
I recommend the Crucial M4 series SSD drives 128GB thru 512 GB..... I would also go with ASUS or LG BluRay DL Rewrite Burners...... I never had much luck with longivity using Samsung CD or DVD in builds for family members
since you listed no network card, try and get an onboard INTEL gigabit port, verses a Realtek gigabit port that is more common on most boards
Good Luck on your New Build
TC