I run a HD 6970 with 3 monitors each at 1280x1024. This comes out to a single desktop with "cranked wings" left and right to keep the distortion much more natural-looking. Total res: 3840x1024.
These aren't the best, but they're all the same brand, similar models, and all share similar bezel... Plus the 2 extra I picked up were used and on-the-cheap (knocked around a bit, got them for $20 each on ebay)
Good for gaming, great for video editing. I love this setup and won't go back to 1 monitor, even if it's a really big one.