lol@playing ps3 games in hd
You could get a 30" 2560x1600 monitor for about a grand I think, but you'd need something considerably more powerful than what you have now (ATi 4890, or 5850 or higher I think is good enough, or a GTX 285/295, though anyone's free to correct me if any of these are inadequate) or go for a multi-monitor setup if you get a 5870, 5970, or Crossfire some 5770s/5850s.