If you do search for a area to cover for example with bing check out one of the following places:
- HodHasharon
- Rishon LeZion
- PetahTikva
- BatYam
- Kfar Saba
The biggest gaps for missing streets are already marked in OpenstreetBugs:
http://osmbugs.org/?lat=32.01695&lon=34.82425&zoom=12
Happy mapping!