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First and foremost I want to commend you for caring enough as a parent to be thinking about this, but I think you're asking the wrong question. While not a parent myself I believe I can speak from my experience of once being a child.

It is my humble opinion that children should be slowly, slowly introduced to technology. The first example that comes to mind is my own introduction to a pocket calculator in the late 1980's. I was given one before I had been exposed to the intermediate concepts of mathematics and looking back it hurt much more than it helped as it immediately became a crutch. I became more interested in getting the problem done than learning from the experience.

A slow and methodical approach to learning is what works best for me, and may not be optimal for everyone. Laying the right foundation is pretty much the only way to excel, and given the perverse incentives that abound in (America's) public schools you need to pretty much accept that it's up to you to make this happen for your child. As someone who didn't have it I cannot stress enough how important it is to have a parent that is intensely interested in helping you build from simple concepts to the advanced, learn how to learn, and how to think critically about everything you encounter. Having someone there to help you cope with the anxiety of being a novice (at life and learning) is worth more than I can express. Making sure your child understands the core of a concept before he or she has access to tools that shortcut and accelerate its use is paramount.

Also, don't be disappointed if they want to write, sculpt, draw, or paint all day. We need artists too.

Good luck.