Radios -Again

[xydix]

Hi i am still very new to all this. Havent received my ethernet sheild yet but did some testing with a serial gateway and IDE serial monitor.
I read several threads about radios.
I bought some NRF24l01+ (from ebay link in mysensors store) and seems to get i range about 10-13 meters indoor but no walls between.
If i have walls and about 7 meters between the signal is lost.
What can i expect?
I was thinking about buying a NRF24L01+PA+LNA for my gateway but in the comments on Aliexpress people doesn't seem to get that much improvement.
Of course, genuine Nordic radios would be nice but i am to cheep for that.
I want good copies. But where? How will i find a seller that sell good low price radios.
And next question, is NRF24l01+ still the way to go?