What offset are your wheels?
IMO, every setup is different, so we can't provide a real answer to question 1. If you can't tolerate any rubbing (and you're sure you want to stick with your 17's), I'd get coilovers. That way you can experiment until you get the ride height as low as you can get it without rubbing.
Why on earth you have no regard for ride comfort or handling is beyond me, but to each his own, I guess. :thinking: