I have about 20 pens in my collection, 5 of them are Viscontis. 3 have the older 14K nibs and two have the palladium nibs (one is stiffer than the other). The 14K Visconti nibs, by far, offer the best writing experience to me. The M800 comes next. I like to mix things up a bit every once in a while, so I have pens from other manufacturers too. But Visconti is top on my list of favorite brands when it comes to the over all package (writing experience, aesthetics, build quality, size). They're expensive but I buy only when I find a deal that offers them at a price I am willing to pay, which is usually quite lower than retail prices. I haven't reached a point yet where I want to buy and use pens from only one manufacturer.

OP, you have a nice collection of Viscontis there. Except for the Lava HS, all others you have are out of my budget. Nonetheless, I drool over them all the time and would love to try them sometime.