Looking into getting the Bilstein 4600's for the front and rear on my Colorado. Currently the Monroe OEM shocks are rusting through and it's hitting hard. So, I heard great things about Bilstein and liked what I saw for their internal components/compression mechanism. But I'm not going to be doing any off-roading, it's just that my state has WAY too many manholes and potholes in the roads. I need something that will almost glide across them without tossing my wife and I in our seats. Any suggestions or are the 4600's solid enough? Not really looking to break the bank and the 5100's seemed too stiff performance-wise for what I was hoping, but I could be mistaken. And are there other things I can do as well to make the ride smoother?