Help choosing the right wireless module

Hello Friends,
I am working on a project of Home Automation System, which includes wireless sensor nodes and a central device.
I am looking for a cheap RF transceiver for transmitting and receiving the signals from sensor nodes.
So I have to receive the data from multiple nodes. So which RF module is fit for the purpose.The module must be compatible with UNO board

I have to communicate with few bits of data.
For multiply receiving the data which one is better multiplexing or multiple channel receiver.
Please help. Its urgent.