Ultranova vs Gaia vs Ion

I have only tried a Roland SH-01 Gaia recently. I liked it because of the sounds I was able to create while demoing it at the Guitar Center. They don't have the Novation Ultranova in stock but they can order you one, which means I couldn't demo it. Anybody got one? I also want to look at the Alesis Ion. I demo-ed it years ago and didn't like it, but that was before I learned how to program synths. I only messed with the demo's.

Which one do you guys like?
If you could buy 2 of them, which 2 would you buy?