There isn't a case for the 1520 @ goheadcase.com. Even if there was one, seems like it would defeat the purpose of showing off the green Lumia color since the other Nokia cases on the site has various color patterns and designs.
I have a white and I put on a clear Sojitek TPU case. It seems to work well and doesn't add any bulk to it. Look on eBay for a crystal clear TPU case it was like 5 bucks.
Tight fit and it covers right up to the screen edge. Nice height on the ring around the camera to protect the lens when you lay the phone down face up... Combine it with a Tempered Glass screen protector and you should really be well protected while maintaining the style of the phone...
I have the armor shield wet screen protector (Case Friendly). I just ordered the clear case you mentioned ^. Thank You. What belt holster do you prefer?