I've got to add that if what you're looking for is a calmer uro than your baby, all you really have to do is wait for him to grow up. Babies tend to be fairly skittish by nature of any species. I don't have personal experience with ornates yet, but I understand that generally an adult ornate is calmer than an adult nigerian/geyri.
So if you want calm, you can wait a few years with yours, or perhaps you need to trade for an adult uro. If you just like the geyri better, then I'd agree with Debb and say that the ornates are generally much more expensive.
Hope this helps,
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Nicki
I care for 4 Uromastyx, 1 Girdled Lizard, 5 Snakes, 2 Toads, Mice, and I help with about 50 newts and salamanders
Member of OARA (Ottawa Amphibian and Reptile Association)