that "gainsworth" is an overpriced paperweight...never even heard of them. evga, pny, asus, gigabyte, msi, and then possibly palit...possibly. that is always the order i shop in for cards. However, i run towards asus as they usually have lower prices than evga or pny. check them out. running their 560s in my case now.
for the person asking about the wireless card. usb's are great, but make sure you plug it into the back of the computer. i had mine in a front usb slot, and it got banged around. they work great, but you have to be gentle.
OCZ isn't a terrible company, but isn't my first choice. Corsair hasn't been dethroned in my mind, and coolermaster makes a close second. other reputable companies would be antec, silverstone, and maybe even rosewill for their lower end models (ran an old 500W from them 6 years straight...no breaks).