Want Total Connectivity In Home.Help??

I want to improve signal transmission and reception in my home.Please suggest some good affordable method like upgrading antennas or repositioning routers to increase wireless range in my house.My router is TP-Link 1043ND With three 3 dbi antennas.There are around 9-10 clients although only 5 clients are used simultaneously. My house Diagram has been uploaded. I am also going to upgrade my laptop's WLAN Card but I am confused between Atheros and Intel.Which one is better?(Currently I use Intel WiFi Link 5100 agn)
Thank u in advance