I use the Pringel 1" lower kit. It is by far the best one I have ever seen and used. It pushes the shock back and down as opposed to just back or just down. I run the standard air shock and Im 230lbs and wife is 5'9 130. I keep it set at 30psi without tour pack and 35 with and have never had any issues. Keep in Mind, I live in South Florida where all the roads are perfectly strait and smooth. No hills, no mountains and very few curves. What is good for me may not be good where you live. As far as the front, Progressive mono tube will lower you an inch and improve the brake dive considerable if your a heavy front braker. I am 80% rear braker so I used the Harley lower springs with heavy weight oil to lower and stiffen me up front.
If I lived up North , I agree with the rest of the guys and would have made suspension a top priority. But truth is I ride North once a year in Sturgis and to drop 2-3K on Suspension is not gonna happen for me.
Your gonna love those bars, I did. While the bars are off you may want to consider plugging the fairing mount worthless mirrors and going with some of the mirrors I have on my bikes they match the Yaffe bars perfect and still very visable.