Unless you plan to do BIAB only you might want to use that 11 gallon pot for your HLT...
Just out of curiosity what do you plan to do with that keg now that you bought a pot?
I never bought a Keg, I was looking for one. Now I don't need one.
I just batch sparge and I buy water from Sobeys (It has served me well, and my water sucks), when when pull off the mash I generally drain into the now empty and clean water bottles, then dump them all back into the pot when I'm ready to start my boil. I only have one burner anyway, so it works well for my setup. It's easier lifting a few 5 gallons bottles to my kettle then lifting a full kettle when I'm switching pots.
Joel