Possibly the HP Pre 3. Perhaps not until it's been around a bit and comes down in price and the firmware's been updated a couple of times.
I've had a go at android devices, but I don't get on with that OS. I like to be able to close applications and know that they're closed.
WebOS looks whizzy, and after using the N900 for a while, I'm not going to be too upset at an app store that has a fraction of the content that android/iDevices have.