Upload & Sell: Off
Try the 70-300 f4.0-5.6 IS USM. It really is a nice lens. I have used both the 55-250 and own the 70-300 and definately prefer the metal mount to the 55-250's plastic mount. Picture quality on the 70-300 is better too I think.
I bought my 70-300 in 2007 and still love it today, and though I payed $550 then, I have seen them for $360/370 recently and that is a bargan. Most interesting is how well it performs on a full frame. Years earlier I had the 30D and later 7D, but recently added a 6D. I works well on that camera too, and the 55-250 wont.
Finally, 75-anything from canon, avoid. As for 70-200 f4 L, non-IS, wonderful lens. Used that too and really liked it's sharpness and image quality but............... No IS, and I won't buy any telephoto again without IS. Too many photo's are soft because you can't hold 150-300mm at 1/125 sec or less, but often need too. 2 years ago I bought the 70-200 f2.8, but not IS. It does what I need, but gosh I wish it had IS, so I won't ever buy a telephoto without IS again.
Just my 2 cents. From an engineer with a camera problem.