..spending money on a 10-22mm when you've already got a 16-35mm f/2.8 seems pointless if you ever have aspirations of going full frame because the cost of that lens alone makes up a good portion of the difference between a high end crop and a full frame.
unless you opt to buy a used 10-22mm, which you can always sell next year for nearly the same you'll pay for it now.
Great thing about good glass, if you can afford to buy it, it'll cost you almost nothing after you sell it if you keep it in nice shape. Even revised new versions rarely depress the price much, if any at times.
Don't be too afraid to do a little "horse-trading." I've done plenty, rarely cost me more than a few hours of my time over the years.