Any of the telephoto only zoom lenses in the 70-200mm or 70-300mm range will perform better than so-called "superzooms" that attempt to cover focal lengths all the way from wide angle to the edges of the super-telephoto range.

The highest quality telephoto lens in the price range you mentioned is the Canon EF 70-200mm f/4L. It is available for around $650-700 new. When the Canon Direct refurbished store has them in stock they sale there for $570 or less, depending on any promotions that may apply.

The only other "bang-for-the-buck" lens would be the Canon EF-S 55-250mm f/4-5.6 IS. See my answer at this question for a fuller explanation. It delivers similar optical performance on an APS-C body as the EF 70-300mm f/4-5.6 IS at about one half the price.

If you want a little more reach, there are many 70-300mm lenses on the market. You generally give up the constant aperture of the 70-200mm lenses and some sharpness, especially above 200mm. If you plan on using the lens at the longest focal length, as many shooters do, weigh the optical performance at 300mm more heavily than at the shorter lengths.

• The Tamron 70-300mm f/4-5.6 Di VC USD gets generally good reviews but is softest at 200-300mm.
• The Canon EF 70-300mm f/4-5.6 IS is slightly sharper in the center between 200-300mm, but softer on the edges than the Tamron.
• The Sigma 70-300mm F/4-5.6 DG OS SLD generally scores below the Canon on sharpness from the center to the edges.

There is a pretty large gap between any of these three lenses in terms of both price and quality with the next tier of 70-300mm telephoto zoom lenses that start at around $1,100.