As of last December, a Radeon HD7850 2GB (HIS one to be exact). Replaced a GTX 580 that I was never especially pleased with.
Picked because of it's price. Despite that it's faster than the GTX 580 in everything except BF3 and uses about a third of the power on average that the 580 needed, it's a good time to buy a graphics card!
I've no special preference on brands, Nvidias are faster AMDs are cheaper, but from about £150upwards they'll all completely blitz 1080p gaming now. Maybe Crysis 3 will change that, we'll see.
Captcha: Nice Marmot. Nice to see that even in Captcha land, the Dude still abides.