The most-used scope on the line is the big (82mm) Kowa. Get the LER 27X lens. Most prefer the straight tube to the angled version. There may be a tiny bit better resolution with the flourite lenses but most don't feel that it's enough to justify the added cost.
I have the Leica Televid and it's certainly mechanically superior to the Kowa. I'd rate the optics a toss-up...and I've compared them side-by-side. Leicas are also completely water-proof. There have been problems with the Kowas there.
All that said, the Germans don't understand 'augenabstand' (eye-relief) and the Japanese have got it down very well. The ability to use the Kowas without burying your eyeball in the ocular (or to use them comfortably while wearing glasses -- which IMO anyone with a measurable IQ does anytime he's on the range) makes all the difference. The German glasses -- Leica, Zeiss, Swarovski (Austrian) etc -- are excellent but they just require you to get too cozy with the eye-piece.
You just have to treat the Kowas a 'little' more tenderly...they aren't as tough.
