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Lift and the average car
As someone who has owned a few cars with lift problems, I'd like to say I don't think it's a very desirable property of anything you plan on driving regularly at highway speed. Minimizing drag by shooting for zero downforce, perhaps, but with actual lift, at speed the car begins to lose traction. It also attains an unappealing "dancing" quality in the rear that generally feels unstable. In wet weather and snowy conditions it can get a bit scary, actually. If you notice, VW has had some problems with rear end lift on the new Beetle. There is a warning in the owners manual that if you have the model with the automatically deployed roof spoiler, adding any other aero devices can make the car dangerously unstable.
Also, positive lift would have a detrimental effect in relation to neutral lift. The lift is caused by drag, and so you would be trading drag for a decrease in friction. I'm willing to bet you'd find they cancel each other out. Lift isn't free after all.
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