Can anybody give me the basic distinctions between the various Vinten tripods. Particularly the 10 and 11, and the 3,5 6 and 8. I’m trying to decide on a Vinten, and I like the price of the used 10s I see (around $1200), but it seems to be an older design or something to the 3, 6 etc. Can’t figure out if this makes it substantially worse, or what and I should spring for a more expensive number in the series.