The Lumia 520:
This affordable WP8 phone is packed with enough goodies and features to make it look like a high end Lumia device (like the 920), it's impressive to note that the Lumia 520 also has a super sensitive screen that allows you to use it while having gloves on.
It will be sold for as low as 130 Euros
The Lumia 520 will be available in the US from the T-Mobile Network sometime in the Q2 2013
Check out the Specs
This Phone is really light and slim in thickness (everything I wanted the 920 to be physically), it has a 4inch screen, an 1GHz processor and it supports microSD; so finally we get a WP8 phone with external memory support.
I think the Lumia 520 is the device you need to start with if you are still pondering about making the switch to Lumia from your old Android or Symbian or BlackBerry phone.
It will become available globally within the Q2