Thanks guys this is helpful. Another one of my concerns was maintaining the mash temp (for BIAB) and although aluminum heats quicker it can also lose that heat just as quickly whereas stainless might not heat as quick but will maintain it a lot better. I'm leaning towards this bad boy: http://morebeer.com/view_product/842...uart_26_Gallon
and adding my own sight glass from http://www.brewhardware.com/
Another question you guys might be able to help with, do you find a thermometer on the pot particularly useful? I've read that with BIAB it doesn't take a very accurate reading so I was thinking stirring like hell and taking a digital read from the top might yield more accurate results.