Two of my favorite "high end" steakhouses;
Boston (former home)- Grill 23. I'll take it over Capital Grille, Abe & Louies, and certainly Ruth's Chris. Flemings is probably #2 for me.
Chicago (current home)- Gibsons. If you're ever in Chicago and want a steak (and possibly run into a celebrity), look no further than this place. Probably my favorite steakhouse out here.