2001 Buick lesabre system.

[Wackzirth88 4]

I recently purchased a 2001 Buick lesabre and want to put a system in it. First things first I need to get a decent head unit in there, tape player isn't gonna cut it lol. But I want to make sure it's done right, I want to keep my steering wheel controls and I was told I'll need something to either bypass the stock amp or integrate it. I've researched it a little but I don't know that I'll get it right still so I came here for help. Is there anyone that has installed a after market headunit in one of these cars? What exactly do I need so that everything will be functional and done correctly?