Leaning Maple--Help Please!

I just planted a red sunset maple and, while the bottom 2 feet of its trunk is perfectly straight, the remaining trunk (10 or so feet) is leaning somewhat. There is a crook or knot (or whatever you call it--it almost looks like a swollen finger joint) in the trunk where it begins to lean. Is is better to have the bottom part of the trunk straight and let the top portion lean, or is it better to lean the bottom so that the top part is straight (since the trunk is bent, there is no way to make whole thing perfectly straight)? Also, would it be too late to fix if I need to (the tree has been in the ground for about 3 weeks now)? Finally, is it possible that this will all even out as the tree grows and the trunk thickens?
This is the first tree I've ever planted (so I have no idea what I am doing) and it's going to be the centerpiece in front of my house, so I want it to look good. Thanks in advance for any advice!
Brian
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do a 2 point staking around 4 feet to get the top portion of the tree going straight up and as the tree increases in girth the "bend" will slowly disappear. what happened was the central leader died back and a side branch took over as leader. in time the demarcations disappear. I ordered 3 kousa varieties and all 3 came with a dead/clipped off central leader stub with one side branch taking over. they looked hunchbacked and I was not pleased at all. Ingrid
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