I'd use a USB cable. If I remember correctly the PhotoSmart line can also be used as a card reader. Don't quote me on this, but I seem to remember a HP representative saying that you could. I have a Xerox M750 and I don't really notice much of a difference except USB seems to be more of a pain then Parallel for installation(I've heard this follows for HPs as well). My understanding of USB is you will fill the buffer quicker, it won't affect print speeds by any significant matter, but your computer will do less work trying to fill the buffer. As the P1000 has 4 megs built in, you fill it quicker then a Parallel, but it won't change your speeds except shaving 1-10 seconds off.
Gariig