Depends on the size of the batch. If you are starting at a 5 gallon batch then I'd start with a 8-10 gallon brewpot. I prefer stainless. I know of some really good brews that came from an aluminum turkey frypot so I guess I'd start with what you have. Just remember that everything that touches the beer after the boil should be sanitized.
If your only doing extract brewing to start, even a 5 gallon pot is fine. When you finish up all you do is added the remaining needed water to the carboy to get it up to the 5 gallons. Turkey pot will work just fine for right now.
The problem with Aluminum, as I understand it, is because of the acidity of the wort you can leech aluminum out of the pot into the wort. Not a good thing if you're concerned about heavy metal poisioning. I don't know this as fact, just what I've read.
I started out with a large SS stock pot. It was only 4 gal but at the time I was only doing extract brews so I just did a 3 gal boil and added water to the carboy to bring it up to 5 gal in the primary. Later on when I started doing all grain my wife bought me a stainless steel turkey fryer (8.5 gal) so we, my brew buddy Bob and I, could do a full 5 gal boil. That lasted for about 6 months before we found a used 15 gal SS beer keg. We cut the top out of it and it makes a great brew kettle. We still use the 8.5 gal pot to heat mash and sparge water in. We are now doing 10 gal batches, we split the brews so 5 gal batches were just going too fast. Put out the word that you're looking for a large SS pot, that's how we got the keg. A friend of my son's had it in his garage and gave it to us, And my brother found a SS turkey fryer and the burner at a garage sale for $10. Scrap metal yards are another good place to look. A keg will run about $45 but they also get industrial size SS pots from time to time.
...and here's a little something Larry Bristol wrote in another thread regarding the same issue:
"It's an old myth. At one time, there was a scare that aluminum in drinking water and from cooking vessels was linked to Alzheimer's Disease. There is little evidence of this in the real world. Here is a link to a FAQ from the National Institute of Environmental Health Sciences:
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