The nex has the best image quality of all the mirrorless compacts at the moment (thanks largely to the aps-c sensor rather than the smaller 4/3rds sensor most of its rivals use).
There’s a 16mm prime and 18-55mm zoom at the moment but Sony have published the lens roadmap:
• Wide fixed focal length CZ available from 2011
• Telephoto zoom available from 2011
• Macro available from 2011
• Portrait available from 2011
• High performance standard zoom G available from 2012
• Wide zoom available from 2012
• Mid-telephoto available from 2012
I went for an ep-1 rather than the nex because the zoom lens is smaller and the body has inbuild anti-shake. But I have a dslr as well so my priorities may be different.
Have a look at the Sony a33 and a55 too. A bigger body but with a zoom lens in place not that much bigger than the nex plus zoom in practical terms, plus it can use the standard alpha mount lenses and has phase detect AF which outperforms the contrast detect systems used on mirrorless compacts (and has a full size aps-c sensor).