Wireless N is Wireless N. Some routers are just single band, 2.4GHz, which will work with anything that is wireless n capable. The 5GHz band is less common but still recognized by plenty of devices, and theoretically, it should provide a faster connection. Look for something like Wireless N 300+300......that means that EACH band, 2.4/5GHz, can have a theoretical max of 300Mbs.
Edit: This is an example of a Dual Band N600(300+300) wireless router. Asus RT-N56U