It's not recommended... unless you already have one and don't mind updating when needed, I guess. There are reasons to use an HD-4000 series, anyway. If you are into old 'lo-res' Windows games, for instance, WIN XP may be a requirement, and you can't expect an HD-5000 or above to be supported there, can you. Some people even have stated here that the HD-4000 is the only series to make sure some degree of blur isn't added on your graphics (interlaced or not) -- don't ask me, though.
If your eye is really sharp (or not that much, actually), by the way, super wide resolutions must be used with a bit of care, mind you. Non-integer horizontal scaling will cause minor pixel distortion you'll notice in some circumstances with the scroll, and once you do, you'll question every game...