Wifi Router required

Budget : Max. 5k

Purpose:
1) Connecting 2 desktop & 1 laptop (with internet)
2) Able to download (Torrents) without computer
3) Can connect using USB Modem

Suggestion required:
1) Asus RT-N13U B1
2) Buffalo WHR-HP-G300N NFINITI Wireless-N 300Mbps Router
3) Buffalo WZR-HP-G300NH NFINITI Wireless-N 300Mbps Router