Narita airport to Meguro late at night?

Our flight arrives at 9pm in Narita airport. This is mine and my friends first time in Japan. We need to get to our airbnb accomodation in Meguro.

I know that there is the N'EX train at 9.44pm to Shinjuku, and the Airport Limosuine Bus at 9.40pm, which I'd prefer to get, as it goes directly to a hotel in Meguro. We'd get a taxi from there on,

My question is what should we do if our flight is delayed and we miss these options? How late does transport out of Narita run? Is there another option that I've missed? We don't have a huge budget so a private shuttle/taxi all the way there would be too much.

(Note: we're backpacking so won't have to wait for any luggage. Hopefully that will save time. How long will customs take?)

The access narita still run until 22:45 between narita and tokyo or ginza(22:00, 22:05, 22:25. 22:45).
http://accessnarita.jp/en/home/

Tokyo Shuttle also run until 23:10(22:00, 22:15, 22:35, 22:55, 23:10).
http://honyaku.j-server.com/LUCKEISEIB/ns/tl.cgi/http://www.keiseibus....

That's very useful, thankyou so much!

Plenty of options. Some others not listed above are:-

Keisei Skyliner/Sky Access to Nippori, then Yamanote line to Meguro.
JR East Sobu/Narita rapid to Tokyo, then Yamanote line to Meguro

Both options are available to around 11pm.

use www.hyperdia.com/en to fin the rail options that work for you.