If you have any question what works for shooters at distance stop by an F-class match as everyone will have at least one spotter with them. Based on my experiences you're likely to find Kowa the most popular by a 5:1 margin vs any other brand, but it's still worth while to take a look through a few first hand out in the real world to see if the differences matter to you. Us shooters are usually pretty friendly.
As far as Hensoldts 45/60, they don't really compare optically with the current Alpha spotters. What they do bring to the table is actual field carry durability and a nice reticle. Some of the Alpha's do better than others, but there isn't any real competition if you require hard use durability, a nice reticle and quality glass. Just don't expect it to defy the laws of physics to beat out the less durable 80+mm scopes in clarity or resolution.
For a bang for the buck option Celestron Regal's in the $600-800 range are a nice option. They come with the eye piece and carrying case, which can be several hundred dollar extras on other scopes. They aren't available with a reticle if that's important to you... Regardless of which brand you choose, unless you need a compact spotter, reticle, or some other specific feature I suggest sticking with 80+mm objectives.