Carlo,
Since you're hooked on the 50 f/1.4 now, you might wanna consider the 28 f/1.8 too for something wider. You don't necessarily need to spend the $$$ on an f/2.8 widezoom, especially one that's APS crop. And if you do get the 28 f/1.8 (or similar), you could consider adding the 17-40L f/4 or the like for a less expensive, non-crop widezoom instead -- or you might even consider one of the various cropped superwide zooms too.
Personally, if I'm gonna spend big $$$ on glass, I'd much prefer to do it on full 35mm lenses, not APS cropped ones, unless it's something much needed at either the superwide end or the long tele end. For the more regular focal length ranges, I think it usually makes more sense to stick w/ non-cropped lenses unless you're quite certain you won't want to upgrade to a fullframe (or even 1.3x crop) body in the forseeable future...
_Man_
Since you're hooked on the 50 f/1.4 now, you might wanna consider the 28 f/1.8 too for something wider. You don't necessarily need to spend the $$$ on an f/2.8 widezoom, especially one that's APS crop. And if you do get the 28 f/1.8 (or similar), you could consider adding the 17-40L f/4 or the like for a less expensive, non-crop widezoom instead -- or you might even consider one of the various cropped superwide zooms too.
Personally, if I'm gonna spend big $$$ on glass, I'd much prefer to do it on full 35mm lenses, not APS cropped ones, unless it's something much needed at either the superwide end or the long tele end. For the more regular focal length ranges, I think it usually makes more sense to stick w/ non-cropped lenses unless you're quite certain you won't want to upgrade to a fullframe (or even 1.3x crop) body in the forseeable future...
_Man_