WOW! The wow factor here is that I sure did not expect 28 responses in less than 12 hours, but I appreciate every one of them.
Regarding the question can I feed 200 out of a drum?; well, out of the Mega I am supposed to have a 20 butt capcity. I did a cook last week for 150; 16 Butts took my UDS and my WSM 2 loads each at 10 and 11 hours on two consecutive days to complete. My objective here is to purchase something that can do the same job or a bit more in one load, and the BDS, Mega, is supposed to. Now I am not giving up any of my other smokers, so I will still have plenty of weapons for sides, appetizers, etc.
And if I find in a couple of years that I need something still bigger, well, I should have made enough money off these other cooks to justify a Lang, Klose, Spicewine or something along those lines.
I think I'll get the BDS... Thx evry1 for their input!