Pretty much all tripods by all manufacturers will fit, as the NEX-5 uses a standard quarter-inch mount. This, in fact, is your biggest problem: way too much choice 
One thing to be aware of is that NEX bodies, being ultra-small by design, naturally provide a small surface area to mate with a tripod, compared to a 'normal' DSLR. This will only be a problem if you use heavier lenses, particularly if you have the camera in portrait orientation, as the grip between the two surfaces may not be enough to stop the camera drooping.
This can be fixed with one of a number of 3rd-party quick-release plates, such as this shaped-to-fit-NEX-5, 'always-on' one, designed to make that surface area bigger. Most of them are specific to the same brand of tripod, so be careful if you choose this route. In any event, try to get something with a head that has a softer rubberised mating surface, rather than hard plastic.
Apart from that, the range of choice of tripods open to you is almost as big as your choice of camera. You need to visit some camera shops... with a light camera, you can choose a relatively light tripod, but needs to be a hands-on evaluation, not something you can do over the internet. Pick one that:
- extends up to your eye level: they don't always!
- is lightweight without being flimsy: often rigidity increases with price...
- has decent-quality fastenings: these are often the first things to break
Finally: if you shoot a lot of video, don't get a ball-head... get a pan-and-tilt 
Cheers
Mick