Very nice choices, Roy and Parker. :-)
For me, that answer would change from day-to-day. Today, it would be this piece, which I'm completely in love with --
I own a lot of my own work in print -- mostly sized 11x14 and 16x20. Having a hard copy in hand makes the work seem 100% more real and relevant to me. Like Silas Marner and his secret stash of gold, I like to take the prints out every so often and just enjoy seeing and showing them, handling, and being surrounded by them.
Prints are a great reminder of what I'm working hard to send out to living and working spaces all over the world. I love my prints! :-)