For telephotos (you did not say 'zoom'), the BEST in terms of solid build and IQ I can think of would easily be any of the older Manual lenses from brands like Nikon, Takumar (Pentax), Olympus Zuikos and or course, Carl Zeiss C/Y. No need to get 3rd party when you can get these, many of which can match or even beat some of today's best teles. The best part is, most of the lenses are relative cheap, and for 1K, you might be able to get 2 or 3 lenses, depending on how hard and smart you shop.
If it's a tele-zoom you want, still no need to get 3rd party. The CANON EF 70-200 L f/4 2nd hand is probably around $750 now after all the price drops.