Shields for arduino due board

Hi all,

I have purchased the arduino due board, I have tested all the digital and analog pins outs of the board with some of basic sensors, its working fine, I am not familiar, which shield to buy for arduino due board since the I/O pins are 3.3v compatible. I am interested in working with gsm, bluetooth , wifi, xbee modules on the arduino due, Can any one suggest the shields to buy to work with these said modules..

Regards,,