Why not just do a search on the web and read reviews?
There will only be a small number of Nex 3 users here and there is no guarantee their opinions will be intelligent or reliable.
If this is just a casual question to introduce yourself as a new member, then perhaps you could browse the forum and find an area that hasn't been discussed, that you are interested in and ask that question.
The biggest difference in the NEX series cameras is how they operate. If you are a casual shooter and not much worried about shooting in manual I think you will be happy.
My spouse has the NEX5 (his Christmas gift in 2011), loves it and I just got him the 18-200mm zoom. Paid $699 for the camera and kit lens. I'm sure you could find an extra $200 somewhere.