This is just me, but I say, figure out if 35mm is going to be a good focal length for taking pictures of your kids. Because the Nikon AF-S 35mm f/1.8 is the only affordable Nikon fast prime that will autofocus on the D5000. If 35mm isn't going to be a great go-to lens for you, then I'd suggest weighing whether you want to pay $450 for a 50mm f/1.4, get a D80/D90, or go with a Canon.
The one thing you need autofocus for is a quickly moving target. And the one thing you need a fast prime for is shooting indoors without a flash. Chasing toddlers about the house tends to be one of the things where you either need to use a flash, or a fast autofocusing prime.
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