Can you recommend a good schematic or module of a Bluetooth + Wi-Fi combo?
For high volume stuff like cellphones and tablets, Wifi and Bluetooth are about 2 square millimeters on the main SOC. See, for example Qualcomm's Snapdragon 600 marketing information http://www.qualcomm.com/snapdragon/processors/600

TI has some interesting modules for doing this

http://processors.wiki.ti.com/index.php/Wireless_Connectivity_Platforms?DCMP=wtbu_ecs&amp;HQS=connectivitywiki

that might work as examples.