The Iron Rat Stout is delicious. I'm at TBBC from time to time, that's what I prefer when I'm there.
I've never brewed a brew bigger than 1065 so, three piece airlock has worked just fine for me on all my batches. As far as straining, another route you could go is to build yourself a hop spider. I use them in all my btaches, you can search on this site for the DIY instructions. Super easy and greta at catching just more than hop particles (coriander, orange peel, jalapenos, etc.).