Thanks for the comments everyone.
The Sesenta was a limited edition pen produced to celebrate the 60th anniversary of something (60 years after the first Vanishing Point?), based on the Decimo size pen and limtied to 400 pieces. I see it is still available from Pen Gallery, but Richard's Pens seems to have sold out already (not on their website anymore).
Hey that's very interesting, I've never seen the Red or Green Sesenta before.... Limited to 100 pens each according to Martini auctions.... That does kinda suck, makes the original Sesenta less special a bit...
The pen that actually gets the most use is the Blue Carbonesque. Two main reasons I guess, it would be the easiest to replace if it got damaged, and also I like to match ink to pen colour and blue is a colour that you would want to have within clicking range. I also use the Red Carbonesque a bit.
Yeah, I think the Red Carbonesque = Kasuri Vermillion. I would love to get the Green Kasuri as well, but the prices for Kasuri pens are just so expensive compared to the Blue or Black carbonesque. I picked up the red one on ebay for $50 + shipping, which was my closest experience to being sumgai already

Haha Col, you're thinking of "pick-up sticks"? I used to play that when I was a kid.... Man, if only I had enough Vanishing Points to play the actual game....

The only problem is, there really are enough variations out there to spend my money on