Tony:
OK... HOPEFULLY last scopes ever

.
I don't want to go down the same track I did with Canon lenses (almost the entire 'L' series and a few others!). I was spending more time getting glass than using it. I mean REALLY - how much use did I
actually have for a 90mm TSE lens or a 200mm 1.8?
Alex,
From my all-to-brief experience with the 105/650 I'm absolutely sold on the Russian triplets. They just seem to sparkle. Razor-sharp and colour free. I'll keep my eyes open down the track.
Curiously, while they're well regarded, they don't seem to get much 'airplay' here. In Japan they are considered a highly desirable optic and sell for a ridiculous premium - particularly the now defunct TMB versions. Check out the Japanese version of the 'kkhoki.com' website.
I suppose the upshot is, if you're a complete sucker for fine glass and machined metal (like me), you could spend you're entire life acquiring 'scopes and rarely use 'em. Granted if your interests change: say for visual to photo or vice-versa, there's a good reason for swapping, but, fingers crossed, I've got me bases covered!