If you want the Peter Luger from its heyday, I highly recommend Wolfgang's Steakhouse (and no, its not Wolfgang Puck).
Wolfgang Zwiener was head waiter at Peter Luger's for over a decade back in the day.
Greats steaks, great sides, great drinks. Several locations in NYC (and elsewhere). Even though it is now a global 'chain', it doesn't feel like it!
http://wolfgangssteakhouse.net/
I went to Peter Luger's like seven years ago... Worse expensive steak dinner I have ever had.... Rude waiters, cash only, rust stained drop down ceiling.... Gross.