Android Devices for development?

[AC Question]

We are planing to purchase Android devices for developing and testing.

We need devices with all densities like LDPI,MDPI,HDPI,XHDPI,XXHDPI in mobiles.

As of now i have below information.If I was wrong or missed some thing please suggest me for perfect device.And suggest devices for missed Dpi's

DPI ............ MOBILE

LDPI .......... Samsung Galaxy Y

MDPI ......... LG Optimus Net

HDPI ......... Samsung S2

XHDPI . .... Samsung S3 or Moto G

XXHDPI.... Samsung S5

In this list some are not available in market and some are out of budget.So,Please some suggest me for best mobiles. Thanks in advance.