fixed lens or DSLR?

[SoCalTiger]

Is there a telephoto lens for the Sony NEX cameras or is the 55mm good enough?

Sony has a decent number of lenses which are compatible. Just do a search for Sony NEX Lenses. Their 55-210mm is reasonably priced and would probably be what you're looking for:

Amazon.com: Sony E 55-210mm F4.5-6.3 Lens for Sony NEX Cameras: Electronics