I want to start with digiscoping too. I've been to a professiolnal with lots of experience with telescopes, binoculars etc..
He advised me the A brands for this. Swarokski is very good even as Leica is.
Its depends of the results you want. It's a little bit difficult for me to explain it in English.
But perhaps you find more information on this site
http://www.swarovskioptik.com/en/digiscoping_principlesI know Swarovski introduced some new version in September this year here in Holland.
At this moment there is a possibilty to buy an occasion of the older types. They are refurbised and technical 100%.
But a lot cheaper as new ones.