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The evolutions have velocity (I own the 249cē, and it even has 16 different velocity curves you can select), but they don't have aftertouch, something you'll only find on more expensive keyboards.
Didn't test the Radium yet, but I sure hope they did a better job than on the oxygen 8 (that one is a nightmare, breaks easily, and it happens a lot that it sends midi control messages even when doing nothing).
You should really look into what you need... Do you really need 61 keys (5 octaves, if making trance or similar you'll rarely need this, use transpose), or can you manage with less (keep in mind all those keyboards still have transpose features)?
Do you want to be able to control other parameters via the keyboard (it's an extra, but it's worth it imo).
I suggest you take the evolution keyboards with controllers (the C stand for control), the number of keys is you choice. If you want even more controllers than the evolution, take a look at the Edirol PCR keyboards (http://www.edirol.com/products/keyboard.html), they not only have programmable controller knobs, but also sliders and buttons that are fully assignable. I like the feel of the evolution keys better myself, but edirol has nothing to be ashamed of either.
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