Okay, so after reading that Gineaux interview I finally put down my Wegen 2.5mm and switched to a 2mm sideways Dunlop. I'm not loving it so far but I'm going to stick with it until the end of the year to get over the initial sense of unfamiliarity.
I was talking to Sami, who recently switched from a 2mm Gator to the 1.5mm Delrin. I have a 2mm Gator and so far I prefer it to my 1.5mm Gator for both my oval hole with Argentines and my archtops with Thomastiks flats. That said, I like Sami's idea about a smoother Delrin pick for round wound strings like the Argentines and a rougher Gator for archtop flats.
Let's all abandon Wegen together and we can get a timeshare in Florida with all the money we save!