You need a 68882 PGA FPU. I'm not sure what a 68832 is.
Most of the stuff you're looking for can be found fairly cheap on eBay. For the rom at least, check for seller amigetta. Good price and great service.
I'd also suggest getting an external scan doubler/flicker fixer so you can plug your machine into a nice VGA monitor.
Either way, you're building a nice first system.
