Assuming you are going to stick with 5 gallon batches, you'll need (most on your wish list already)
- That turkey fryer. Use the AL pot for a hot liquor tank.
- A mash turn (converted cooler!) + a big ass stir spoon/paddle.
- An accurate thermometer for the 150-170f range.
- A good boil kettle. 15 gallon is a touch big for 5 gallon batch, you should have 7ish gallons of wort to boil down after sparging.
- Wort chiller.
- Paint strainer.