Thanks! I figured that the AMD64 was what I was looking for. I checked Debian's site and lists and didn't see explicit support for the Turion flavor, so I wasn't sure it would take the AMD64 port. I have a copy of Etch i386 handy in case I run into problems. I'm anticipating the usual HP headaches ( Broadcom wireless, Odd Nvidia set up, cool peripherals with obscure installs, etc ).
I've also seen posts that you need to set a value like pci=nopirq in the boot options ( that value is not correct, couldn't find the right one ). I dont' need the laptop up and running right away, so this should be a fun way to learn more. I would like to utilize the full potential of the 64 bit hardware. I'll probably be back soon on the laptop and other forums!