I have an 80L aluminium pot with 1/2" s/s ball valve and strainer fitted. It's pretty damn sturdy but is maybe in retrospect, a touch big for my single batch requirements.
If you are looking to step up to a larger pot for bigger batches, or even double batches (I'm pretty sure it's big enough) then I'd be happy to swap for your functioning 50L pot with ball valve attached.
I'm in Sydney and have no wish to travel too far to do the swap, so Sydneysiders only please.
Pot also comes with a spare strainer. (both are the braided s/s hose type)