I like the thread that primabella sent you is great!!!...or just go to petfinder.org...there is also a quiz there....though everyone has mentioned Wonderful dogs....I personally don't see one of those breeds being Happy and Healthy in N.Y.C.
also,remember...though you have the summer off...which is Great for puppy bonding...what have you planned to do after that?????
Puppyhood lasts a LOT longer than 2 months....The bigger the breed,the longer it lasts!!!!

There is also a great rescue organization in N.Y.
You can go to their site and get info....

nsal.org
they will help you find the right mix for your lifestyle...!!!!

Good Luck!!!!!!
Let us know how it all works out