Sorry I didn't post back in here - I was kind of embarrassed.
I didn't follow y'all's advice and I went ahead and payed with the eCheck. I didn't hear from the guy for a while, and eBay still says I have to pay for the item. But the keyboard arrived today! It is a beaut!
There's a story about the delivery - I have a really steep driveway, and the FedEx guy had trouble backing up it (his tires started skidding), so he stopped at the bottom. He was like, "Do you have a heavy package, like 100 pounds?" Yup. He asks, "Does it need to go up there?" Yup. Then he says, "Do you mind if I carry it up?" No problem, I thought maybe the handtruck would be easier, or he could back up, but he wasn't gonna try and back up again. So he drags it to the edge of the truck, then asks, "Could you help me?" I said "sure if you help me carry it into the house!" At first he was reticent, but he ended up waiting. And thank goodness - at first, between the two of us it was ok, but it was feeling REALLY HEAVY by the time we got it up the stairs. My arms are still aching! I don't think I could have gotten it in the house by myself, and my wife wouldn't let me slide it to the room it needed to go to. I should probably start lifting weights and try and build up some muscles!
Do you think it will be a problem with eBay that my item is still marked unpaid? I've emailed him a couple of times, and he answers but he doesn't answer everything I ask. Maybe he's waiting to get feedback? (which I gave)