Widest I had was the 24-70, and I wished I had wider. If you want to get all those tall buildings in frame from the ground an UWA is a must. I went to B&H to buy one, only to discover I had lost my passport somewhere along the way :/ I was buying a 14mm used prime, and using my card to pay - they always ask for ID, which is great, as I wouldn't have noticed it missing until we were leaving otherwise!
The guys at B&H were brill, they tried their best to help me locate the passport, they called all of the places I had been that morning but no luck. In the end the concierge at the hotel located it for me, it was handed in to Macy's lost and found - phew! - B&H emailed me after I'd come home, asking if I had found it and got home alright. Thought that was nice of them.
Because of thick fog for half the time we were there we didn't get out to the statue or Brooklyn bridge. An excuse to go back some day!
Top of rock is great, amazing view. But they don't like anyone queuing until your allotted time. It can get cramped at the entrance with so many people waiting for their turn to head up, they only take so many at a time. Just get your ticket, go have something to eat - plenty of options in the Rockafella centre, and only go back to the entrance for TOR at the precise time you were given. You can indeed take a gorrilapod up there, I saw people with tripods even. Just fold them up and stick them in your bag before going for the elevator. There's a hall on the second to highest floor where you can set a gorrilapod up on the window ledges. Because of the glass panels on the top, there isn't really anywhere to set them up there. If you did manage to get your tripod up you'll need to extend it full to get a clear view. Most of the shots I took up there were hand held, pushed the lens flat against the glass and managed anything up to 1" exposures. From the lower floor on the window ledge I could do much longer, but the glass is a bit dirty, and unless you press right against it you'll get reflections from behind.
Your wide angle and 50mm will do nicely in general.