Ive decided to use Xbee PRO radios. They are cheap and i dont have to program anything, just have to send data to them using UART and they can transmit. Also, they come with an interface board too, therefore it will be easy for me to interface one the radios to the server (PC) and make it a base radio through which all others will be connected, but at one time only one radio can be connected, so its actually a P2P connection. What say guys??